diff --git a/CHANGELOG.md b/CHANGELOG.md
index 767d4c5..8367e68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 * [UIPQB-168](https://folio-org.atlassian.net/browse/UIPQB-168) Allow editing queries containing no fields.
 * [UIPQB-141](https://folio-org.atlassian.net/browse/UIPQB-141) Modal dialog focus inconsistencies across screenreaders.
+* [UIPQB-162](https://folio-org.atlassian.net/browse/UIPQB-162) Errors when query includes a modified custom field.
 
 ## [1.2.6](https://github.com/folio-org/ui-plugin-query-builder/tree/v1.2.6) (2024-12-11)
 
diff --git a/src/QueryBuilder/QueryBuilder/QueryBuilderModal/RepeatableFields/RepeatableFields.js b/src/QueryBuilder/QueryBuilder/QueryBuilderModal/RepeatableFields/RepeatableFields.js
index add54c1..097ed98 100644
--- a/src/QueryBuilder/QueryBuilder/QueryBuilderModal/RepeatableFields/RepeatableFields.js
+++ b/src/QueryBuilder/QueryBuilder/QueryBuilderModal/RepeatableFields/RepeatableFields.js
@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { memo, useEffect, useRef } from 'react';
 import {
   IconButton,
   RepeatableField,
@@ -8,9 +8,11 @@ import {
   Row,
   getFirstFocusable
 } from '@folio/stripes/components';
+import { useShowCallout } from "@folio/stripes-acq-components";
+import {MESSAGE_TYPES} from "@folio/lists/src/hooks/useMessages/useMessages";
 
 import PropTypes from 'prop-types';
-import { useIntl } from 'react-intl';
+import {FormattedMessage, useIntl} from 'react-intl';
 import { QueryBuilderTitle } from '../../QueryBuilderTitle';
 import css from '../QueryBuilderModal.css';
 import { COLUMN_KEYS } from '../../../../constants/columnKeys';
@@ -23,9 +25,12 @@ import {
 } from '../../helpers/selectOptions';
 import { BOOLEAN_OPERATORS } from '../../../../constants/operators';
 import { DataTypeInput } from '../DataTypeInput';
+import {findMissingValues} from "../../helpers/query";
 
-export const RepeatableFields = ({ source, setSource, getParamsSource, columns }) => {
+export const RepeatableFields = memo(({ source, setSource, getParamsSource, columns }) => {
   const intl = useIntl();
+  const callout = useShowCallout();
+  const calloutCalledRef = useRef(false);
 
   const fieldOptions = getFieldOptions(columns);
 
@@ -84,6 +89,7 @@ export const RepeatableFields = ({ source, setSource, getParamsSource, columns }
           },
         };
       }
+
       if (isOperator) {
         return {
           [COLUMN_KEYS.VALUE]: {
@@ -113,6 +119,27 @@ export const RepeatableFields = ({ source, setSource, getParamsSource, columns }
     }));
   };
 
+  useEffect(() => {
+    if (calloutCalledRef.current) return;
+
+    const deletedFields = findMissingValues(fieldOptions, source)
+
+    if(deletedFields.length >= 1) {
+      calloutCalledRef.current = true;
+
+      callout({
+        type: MESSAGE_TYPES.WARNING,
+        message: (
+            <FormattedMessage
+                id="ui-plugin-query-builder.warning.deletedField"
+                values={{value: deletedFields.join(',')}}
+            />
+        ),
+        timeout: 0,
+      })
+    }
+  }, []);
+
   return (
     <>
       <QueryBuilderTitle results={source} />
@@ -201,7 +228,7 @@ export const RepeatableFields = ({ source, setSource, getParamsSource, columns }
       />
     </>
   );
-};
+});
 
 RepeatableFields.propTypes = {
   source: PropTypes.arrayOf(PropTypes.object),
diff --git a/src/QueryBuilder/QueryBuilder/helpers/query.js b/src/QueryBuilder/QueryBuilder/helpers/query.js
index d29cc45..eb15c82 100644
--- a/src/QueryBuilder/QueryBuilder/helpers/query.js
+++ b/src/QueryBuilder/QueryBuilder/helpers/query.js
@@ -279,3 +279,20 @@ export const mongoQueryToSource = async ({
 
   return [singleItem];
 };
+
+export const findMissingValues = (
+    mainArray,
+    secondaryArray
+) => {
+  const mainValues = new Set(mainArray?.map((item) => item.value));
+
+  const missingValues = [];
+  for (const secondaryItem of secondaryArray) {
+    const currentValue = secondaryItem.field.current;
+    if (currentValue && !mainValues.has(currentValue)) {
+      missingValues.push(currentValue);
+    }
+  }
+
+  return missingValues;
+}
diff --git a/src/QueryBuilder/QueryBuilder/helpers/query.test.js b/src/QueryBuilder/QueryBuilder/helpers/query.test.js
index 1451062..eba8db7 100644
--- a/src/QueryBuilder/QueryBuilder/helpers/query.test.js
+++ b/src/QueryBuilder/QueryBuilder/helpers/query.test.js
@@ -1,4 +1,4 @@
-import { getTransformedValue, isQueryValid, mongoQueryToSource, sourceToMongoQuery } from './query';
+import {findMissingValues, getTransformedValue, isQueryValid, mongoQueryToSource, sourceToMongoQuery} from './query';
 import { booleanOptions } from './selectOptions';
 import { OPERATORS } from '../../../constants/operators';
 import { fieldOptions } from '../../../../test/jest/data/entityType';
@@ -372,3 +372,91 @@ describe('getTransformedValue', () => {
     expect(actual).toEqual(expected);
   });
 });
+
+describe('findMissingValues', () => {
+  it('should return missing values from secondaryArray that are not in mainArray', () => {
+    const mainArray = [
+      { value: 'value1' },
+      { value: 'value2' },
+      { value: 'value3' },
+    ];
+
+    const secondaryArray = [
+      { field: { current: 'value2' } },
+      { field: { current: 'value4' } },
+      { field: { current: 'value5' } },
+    ];
+
+    const result = findMissingValues(mainArray, secondaryArray);
+
+    expect(result).toEqual(['value4', 'value5']);
+  });
+
+  it('should return an empty array when all values are present in mainArray', () => {
+    const mainArray = [
+      { value: 'value1' },
+      { value: 'value2' },
+    ];
+
+    const secondaryArray = [
+      { field: { current: 'value1' } },
+      { field: { current: 'value2' } },
+    ];
+
+    const result = findMissingValues(mainArray, secondaryArray);
+
+    expect(result).toEqual([]);
+  });
+
+  it('should handle cases where mainArray is empty', () => {
+    const mainArray = [];
+
+    const secondaryArray = [
+      { field: { current: 'value1' } },
+      { field: { current: 'value2' } },
+    ];
+
+    const result = findMissingValues(mainArray, secondaryArray);
+
+    expect(result).toEqual(['value1', 'value2']);
+  });
+
+  it('should handle cases where secondaryArray is empty', () => {
+    const mainArray = [
+      { value: 'value1' },
+      { value: 'value2' },
+    ];
+
+    const secondaryArray = [];
+
+    const result = findMissingValues(mainArray, secondaryArray);
+
+    expect(result).toEqual([]);
+  });
+
+  it('should handle cases where both arrays are empty', () => {
+    const mainArray = [];
+    const secondaryArray = [];
+
+    const result = findMissingValues(mainArray, secondaryArray);
+
+    expect(result).toEqual([]);
+  });
+
+  it('should ignore null or undefined values in secondaryArray', () => {
+    const mainArray = [
+      { value: 'value1' },
+      { value: 'value2' },
+    ];
+
+    const secondaryArray = [
+      { field: { current: 'value3' } },
+      { field: { current: null } },
+      { field: { current: undefined } },
+    ];
+
+    const result = findMissingValues(mainArray, secondaryArray);
+
+    expect(result).toEqual(['value3']);
+  });
+});
diff --git a/translations/ui-plugin-query-builder/en.json b/translations/ui-plugin-query-builder/en.json
index e175289..595c4a8 100644
--- a/translations/ui-plugin-query-builder/en.json
+++ b/translations/ui-plugin-query-builder/en.json
@@ -35,5 +35,7 @@
   "error.sww": "Something went wrong",
   "error.occurredMessage": "An error occurred.",
 
+  "warning.deletedField": "{value} in your query is unavailable. Please revise your query. ",
+
   "ariaLabel.columnFilter": "Column filter input"
 }