diff --git a/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/numeric-input-parser.util.spec.ts b/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/numeric-input-parser.util.spec.ts
new file mode 100644
index 00000000000..52b9d19ed99
--- /dev/null
+++ b/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/numeric-input-parser.util.spec.ts
@@ -0,0 +1,293 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { FormlyFieldConfig } from "@ngx-formly/core";
+import { FormlyJsonschema } from "@ngx-formly/core/json-schema";
+import { applySafeNumericParser, parseNumericInput } from "./numeric-input-parser.util";
+
+describe("parseNumericInput", () => {
+  it("returns the number for a numeric value", () => {
+    expect(parseNumericInput(10)).toEqual(10);
+    expect(parseNumericInput(0)).toEqual(0);
+    expect(parseNumericInput(-5)).toEqual(-5);
+  });
+
+  it("parses numeric strings", () => {
+    expect(parseNumericInput("10")).toEqual(10);
+    expect(parseNumericInput("-5")).toEqual(-5);
+    expect(parseNumericInput("0")).toEqual(0);
+    expect(parseNumericInput("3.5")).toEqual(3.5);
+  });
+
+  it("treats empty / null / undefined as null", () => {
+    expect(parseNumericInput("")).toBeNull();
+    expect(parseNumericInput(null)).toBeNull();
+    expect(parseNumericInput(undefined)).toBeNull();
+  });
+
+  it("returns null for non-numeric input instead of throwing", () => {
+    expect(parseNumericInput("abc")).toBeNull();
+    expect(parseNumericInput("1a")).toBeNull();
+    expect(parseNumericInput({})).toBeNull();
+  });
+
+  it("preserves negative and zero values (does not clamp to 1)", () => {
+    // Guards the reported bug: a negative limit must pass through unchanged here,
+    // not be turned into 1 or dropped.
+    expect(parseNumericInput(-100)).toEqual(-100);
+    expect(parseNumericInput("-1")).toEqual(-1);
+  });
+
+  it("parses negative decimals and whitespace-padded numbers", () => {
+    expect(parseNumericInput("-3.5")).toEqual(-3.5);
+    expect(parseNumericInput("  10  ")).toEqual(10);
+  });
+
+  it("treats whitespace-only strings as null", () => {
+    expect(parseNumericInput(" ")).toBeNull();
+    expect(parseNumericInput("   ")).toBeNull();
+    expect(parseNumericInput("\t")).toBeNull();
+  });
+
+  it("rejects NaN and infinities as null", () => {
+    expect(parseNumericInput(NaN)).toBeNull();
+    expect(parseNumericInput(Infinity)).toBeNull();
+    expect(parseNumericInput(-Infinity)).toBeNull();
+    expect(parseNumericInput("Infinity")).toBeNull();
+  });
+
+  it("rejects non-number/non-string values (boolean, array, object) as null", () => {
+    expect(parseNumericInput(true)).toBeNull();
+    expect(parseNumericInput(false)).toBeNull();
+    expect(parseNumericInput([5])).toBeNull();
+    expect(parseNumericInput([1, 2])).toBeNull();
+  });
+
+  it("preserves large finite numbers", () => {
+    expect(parseNumericInput(1_000_000_000)).toEqual(1_000_000_000);
+    expect(parseNumericInput("2000000")).toEqual(2000000);
+  });
+
+  it("never touches the DOM (safe to call without an element)", () => {
+    // The whole point of the replacement: no document.querySelector / .validity access.
+    expect(() => parseNumericInput("42")).not.toThrow();
+    expect(parseNumericInput("42")).toEqual(42);
+  });
+});
+
+describe("applySafeNumericParser", () => {
+  it("replaces a numeric field's existing (crash-prone) parser with the safe one", () => {
+    // Mimics @ngx-formly's parser that throws on nz-input-number when the value is null.
+    const crashingParser = () => {
+      throw new TypeError("Cannot read properties of undefined (reading 'badInput')");
+    };
+    const field: FormlyFieldConfig = { type: "integer", parsers: [crashingParser] };
+
+    applySafeNumericParser(field);
+
+    // the crash-prone parser is gone
+    expect(field.parsers).toHaveLength(1);
+    expect(field.parsers?.[0]).not.toBe(crashingParser);
+    // the null intermediate state that used to crash is now handled safely
+    expect(() => (field.parsers?.[0] as (v: unknown, f: FormlyFieldConfig) => unknown)(null, field)).not.toThrow();
+    expect((field.parsers?.[0] as (v: unknown, f: FormlyFieldConfig) => unknown)(null, field)).toBeNull();
+    // and it still converts real values
+    expect((field.parsers?.[0] as (v: unknown, f: FormlyFieldConfig) => unknown)("10", field)).toEqual(10);
+    expect((field.parsers?.[0] as (v: unknown, f: FormlyFieldConfig) => unknown)("-5", field)).toEqual(-5);
+  });
+
+  it("replaces the parser for type 'number' too (not just 'integer')", () => {
+    const field: FormlyFieldConfig = {
+      type: "number",
+      parsers: [
+        () => {
+          throw new Error("original numeric parser should not run");
+        },
+      ],
+    };
+
+    applySafeNumericParser(field);
+
+    expect((field.parsers?.[0] as (v: unknown, f: FormlyFieldConfig) => unknown)("3.5", field)).toEqual(3.5);
+  });
+
+  it("does NOT touch an enum (select) field's parser", () => {
+    // Attribute selectors are 'enum' fields; they carry a (string) parser but render as a
+    // select, not nz-input-number, so they must be left alone.
+    const enumParser = (v: unknown) => v;
+    const field: FormlyFieldConfig = { type: "enum", parsers: [enumParser] };
+
+    applySafeNumericParser(field);
+
+    expect(field.parsers?.[0]).toBe(enumParser);
+  });
+
+  it("does NOT touch a string field's parser (regression: text inputs must keep working)", () => {
+    // FormlyJsonschema also sets a parser on string fields. Replacing it with the numeric
+    // parser would turn typed text into null and break every text property across all
+    // operators, so string fields must be left completely alone.
+    const stringParser = (v: unknown) => v;
+    const field: FormlyFieldConfig = { type: "string", parsers: [stringParser] };
+
+    applySafeNumericParser(field);
+
+    expect(field.parsers).toHaveLength(1);
+    expect(field.parsers?.[0]).toBe(stringParser); // exact same parser, untouched
+    // typed text still passes through unchanged
+    expect((field.parsers?.[0] as (v: unknown, f: FormlyFieldConfig) => unknown)("hello", field)).toEqual("hello");
+  });
+
+  it("leaves non-numeric fields (without parsers) untouched", () => {
+    const field: FormlyFieldConfig = { type: "string" };
+
+    applySafeNumericParser(field);
+
+    expect(field.parsers).toBeUndefined();
+  });
+
+  it("does not add parsers to a field that had none", () => {
+    const field: FormlyFieldConfig = { key: "someBoolean", type: "boolean" };
+
+    applySafeNumericParser(field);
+
+    expect(field.parsers).toBeUndefined();
+  });
+
+  it("the replacement parser treats the clear-field cases ('' and null) as null", () => {
+    const field: FormlyFieldConfig = {
+      type: "integer",
+      parsers: [
+        () => {
+          throw new Error("original parser should not run");
+        },
+      ],
+    };
+
+    applySafeNumericParser(field);
+    const parser = field.parsers?.[0] as (v: unknown, f: FormlyFieldConfig) => unknown;
+
+    expect(parser("", field)).toBeNull();
+    expect(parser(null, field)).toBeNull();
+  });
+
+  it("collapses multiple existing parsers into a single safe one", () => {
+    const field: FormlyFieldConfig = { type: "integer", parsers: [() => 1, () => 2] };
+
+    applySafeNumericParser(field);
+
+    expect(field.parsers).toHaveLength(1);
+    expect((field.parsers?.[0] as (v: unknown, f: FormlyFieldConfig) => unknown)("7", field)).toEqual(7);
+  });
+
+  it("leaves an empty parsers array untouched (nothing to replace)", () => {
+    const field: FormlyFieldConfig = { type: "integer", parsers: [] };
+
+    applySafeNumericParser(field);
+
+    expect(field.parsers).toEqual([]);
+  });
+});
+
+describe("applySafeNumericParser with the real FormlyJsonschema (integration)", () => {
+  // Uses the actual @ngx-formly/core json-schema conversion (not hand-built fields) to
+  // prove, against real library behavior, that only numeric fields are affected. This is
+  // the exact concern behind the earlier "all operators can't input values" regression:
+  // FormlyJsonschema sets a parser on BOTH string and number fields, so the guard must
+  // touch only the numeric one.
+  const jsonSchema = new FormlyJsonschema();
+
+  it("replaces a real integer field's parser but leaves a real string field's parser intact", () => {
+    const stringField = jsonSchema.toFieldConfig({ type: "string" });
+    const integerField = jsonSchema.toFieldConfig({ type: "integer" });
+
+    // premise: the library really does set parsers on both, and the types are as expected
+    expect(stringField.type).toEqual("string");
+    expect(integerField.type).toEqual("integer");
+    expect((stringField.parsers ?? []).length).toBeGreaterThan(0);
+    expect((integerField.parsers ?? []).length).toBeGreaterThan(0);
+
+    const originalStringParser = stringField.parsers![0];
+
+    applySafeNumericParser(stringField);
+    applySafeNumericParser(integerField);
+
+    // the string field is completely untouched → text still passes through unchanged,
+    // i.e. every text property on every operator keeps working
+    expect(stringField.parsers![0]).toBe(originalStringParser);
+    expect(
+      (stringField.parsers![0] as (v: unknown, f: FormlyFieldConfig) => unknown)("hello world", stringField)
+    ).toEqual("hello world");
+
+    // the integer field is switched to the safe numeric parser
+    expect((integerField.parsers![0] as (v: unknown, f: FormlyFieldConfig) => unknown)("10", integerField)).toEqual(10);
+    expect((integerField.parsers![0] as (v: unknown, f: FormlyFieldConfig) => unknown)(null, integerField)).toBeNull();
+  });
+
+  it("leaves a real string field WITH an enum (attribute-selector style) intact", () => {
+    // An attribute selector is a string schema with an enum → the library makes it type
+    // 'enum'; its parser (set during the string phase) must not be swapped.
+    const enumField = jsonSchema.toFieldConfig({ type: "string", enum: ["a", "b", "c"] });
+    expect(enumField.type).toEqual("enum");
+    const originalParser = enumField.parsers?.[0];
+
+    applySafeNumericParser(enumField);
+
+    expect(enumField.parsers?.[0]).toBe(originalParser);
+  });
+
+  it("invariant across every JSON-schema field type: only number/integer are changed", () => {
+    // Operators are just combinations of these property types, so proving the invariant
+    // per type proves it for all (hundreds of) operators: applySafeNumericParser must
+    // change field.parsers ONLY for number/integer, and leave the parsers reference
+    // byte-for-byte identical for every other type.
+    const schemas: Record<string, object> = {
+      string: { type: "string" },
+      "string+minLength": { type: "string", minLength: 2 },
+      "string+pattern": { type: "string", pattern: "^a" },
+      "string+enum": { type: "string", enum: ["a", "b"] },
+      "nullable-string": { type: ["string", "null"] },
+      boolean: { type: "boolean" },
+      array: { type: "array", items: { type: "string" } },
+      "array-of-numbers": { type: "array", items: { type: "integer" } },
+      object: { type: "object", properties: { x: { type: "string" } } },
+      const: { const: "fixed" },
+      integer: { type: "integer" },
+      number: { type: "number" },
+      "nullable-integer": { type: ["integer", "null"] },
+    };
+
+    for (const [name, schema] of Object.entries(schemas)) {
+      const field = jsonSchema.toFieldConfig(schema as never);
+      const parsersBefore = field.parsers;
+      const isNumeric = field.type === "number" || field.type === "integer";
+
+      applySafeNumericParser(field);
+
+      if (isNumeric) {
+        // numeric fields get the safe parser (when the library gave them one)
+        if (parsersBefore && parsersBefore.length > 0) {
+          expect(field.parsers?.[0], `numeric type "${name}" should be replaced`).not.toBe(parsersBefore[0]);
+        }
+      } else {
+        // every non-numeric type keeps the exact same parsers reference (fully untouched)
+        expect(field.parsers, `non-numeric type "${name}" must be untouched`).toBe(parsersBefore);
+      }
+    }
+  });
+});
diff --git a/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/numeric-input-parser.util.ts b/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/numeric-input-parser.util.ts
new file mode 100644
index 00000000000..d7bfcc53503
--- /dev/null
+++ b/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/numeric-input-parser.util.ts
@@ -0,0 +1,64 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { FormlyFieldConfig } from "@ngx-formly/core";
+
+/**
+ * Null-safe parser for numeric (integer/number) property fields.
+ *
+ * It replaces @ngx-formly/core's json-schema integer/number parser, which reads
+ * `document.querySelector('#' + field.id).validity.badInput`. That code assumes the
+ * field id is on the native `<input>`, but ng-zorro's `nz-input-number` puts the id
+ * on its host element (which has no `.validity`), so the parser throws
+ * "Cannot read properties of undefined (reading 'badInput')" and typed edits never
+ * commit. This version does no DOM access: it just converts the value to a number, or
+ * null when it is empty/undefined/not a number.
+ */
+export function parseNumericInput(value: unknown): number | null {
+  if (typeof value === "number") {
+    // Reject NaN and ±Infinity — only real, finite numbers are valid.
+    return Number.isFinite(value) ? value : null;
+  }
+  if (typeof value === "string") {
+    const trimmed = value.trim();
+    if (trimmed === "") {
+      return null;
+    }
+    const parsed = Number(trimmed);
+    return Number.isFinite(parsed) ? parsed : null;
+  }
+  // null, undefined, boolean, object, array, etc. are not valid numeric input.
+  return null;
+}
+
+/**
+ * Replace a numeric field's crash-prone Formly parser with {@link parseNumericInput}.
+ *
+ * FormlyJsonschema sets `parsers` on integer/number fields (the crash-prone one) but
+ * ALSO on string fields (a different, harmless one). Only the numeric parser causes the
+ * nz-input-number crash, so restrict the swap to number/integer fields — replacing a
+ * string field's parser with a numeric one would drop all typed text and break every
+ * text property. Leave every other field untouched.
+ */
+export function applySafeNumericParser(field: FormlyFieldConfig): void {
+  const isNumericField = field.type === "number" || field.type === "integer";
+  if (isNumericField && field.parsers && field.parsers.length > 0) {
+    field.parsers = [value => parseNumericInput(value)];
+  }
+}
diff --git a/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/operator-property-edit-frame.component.ts b/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/operator-property-edit-frame.component.ts
index 2512fecdacb..38b5bde66e6 100644
--- a/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/operator-property-edit-frame.component.ts
+++ b/frontend/src/app/workspace/component/property-editor/operator-property-edit-frame/operator-property-edit-frame.component.ts
@@ -74,6 +74,7 @@ import { WorkflowPveService } from "../../../service/virtual-environment/virtual
 import { ComputingUnitStatusService } from "../../../../common/service/computing-unit/computing-unit-status/computing-unit-status.service";
 import { of } from "rxjs";
 import { map, switchMap, take } from "rxjs/operators";
+import { applySafeNumericParser } from "./numeric-input-parser.util";
 
 Quill.register("modules/cursors", QuillCursors);
 
@@ -488,6 +489,15 @@ export class OperatorPropertyEditFrameComponent implements OnInit, OnChanges, On
         },
       };
 
+      // @ngx-formly/core's json-schema parser for integer/number fields reads
+      // document.querySelector('#' + field.id).validity.badInput, assuming the id is on
+      // the native <input>. ng-zorro's nz-input-number puts the id on its host element
+      // (which has no `.validity`), so that parser throws
+      // "Cannot read properties of undefined (reading 'badInput')" and typed edits never
+      // commit — the field gets stuck (only the +/- steppers work). FormlyJsonschema only
+      // sets `parsers` for numeric fields, so replace it with a null-safe parser here.
+      applySafeNumericParser(mappedField);
+
       // Disable dummy operator for user
       if (mappedField.key === "dummyOperator") {
         mappedField.expressions = {