diff --git a/packages/bruno-app/src/components/RequestTabs/RequestTab/index.js b/packages/bruno-app/src/components/RequestTabs/RequestTab/index.js
index 38ca44be3..10a488875 100644
--- a/packages/bruno-app/src/components/RequestTabs/RequestTab/index.js
+++ b/packages/bruno-app/src/components/RequestTabs/RequestTab/index.js
@@ -22,6 +22,7 @@ import NewRequest from 'components/Sidebar/NewRequest/index';
 import GradientCloseButton from './GradientCloseButton';
 import { flattenItems } from 'utils/collections/index';
 import { closeWsConnection } from 'utils/network/index';
+import { getInvalidVariableNames } from 'utils/common/variables';
 import ExampleTab from '../ExampleTab';
 import toast from 'react-hot-toast';
 
@@ -356,6 +357,11 @@ const RequestTab = ({ tab, collection, tabIndex, collectionRequestTabs, folderUi
                 window.addEventListener('dotenv-save-failed', onFailed, { once: true });
                 window.dispatchEvent(new Event('dotenv-save'));
               } else if (draft?.environmentUid && draft?.variables) {
+                const invalidNames = getInvalidVariableNames(draft.variables);
+                if (invalidNames.length > 0) {
+                  toast.error(`Invalid variable name(s): ${invalidNames.join(', ')}`);
+                  return;
+                }
                 dispatch(saveEnvironment(draft.variables, draft.environmentUid, collection.uid))
                   .then(() => {
                     dispatch(clearEnvironmentsDraft({ collectionUid: collection.uid }));
@@ -402,6 +408,11 @@ const RequestTab = ({ tab, collection, tabIndex, collectionRequestTabs, folderUi
                 window.addEventListener('dotenv-save-failed', onFailed, { once: true });
                 window.dispatchEvent(new Event('dotenv-save'));
               } else if (draft?.environmentUid && draft?.variables) {
+                const invalidNames = getInvalidVariableNames(draft.variables);
+                if (invalidNames.length > 0) {
+                  toast.error(`Invalid variable name(s): ${invalidNames.join(', ')}`);
+                  return;
+                }
                 dispatch(saveGlobalEnvironment({ variables: draft.variables, environmentUid: draft.environmentUid }))
                   .then(() => {
                     dispatch(clearGlobalEnvironmentDraft());
diff --git a/packages/bruno-app/src/providers/App/ConfirmAppClose/SaveRequestsModal.js b/packages/bruno-app/src/providers/App/ConfirmAppClose/SaveRequestsModal.js
index 7030c5fcf..799b7f197 100644
--- a/packages/bruno-app/src/providers/App/ConfirmAppClose/SaveRequestsModal.js
+++ b/packages/bruno-app/src/providers/App/ConfirmAppClose/SaveRequestsModal.js
@@ -6,6 +6,7 @@ import { useSelector } from 'react-redux';
 import { useDispatch } from 'react-redux';
 import { findCollectionByUid, flattenItems, isItemARequest, hasRequestChanges, findEnvironmentInCollection } from 'utils/collections';
 import { pluralizeWord } from 'utils/common';
+import { getInvalidVariableNames } from 'utils/common/variables';
 import { completeQuitFlow } from 'providers/ReduxStore/slices/app';
 import { saveMultipleRequests, saveMultipleCollections, saveMultipleFolders, saveEnvironment, closeTabs } from 'providers/ReduxStore/slices/collections/actions';
 import { saveGlobalEnvironment, clearGlobalEnvironmentDraft } from 'providers/ReduxStore/slices/global-environments';
@@ -13,6 +14,7 @@ import { deleteRequestDraft, deleteCollectionDraft, deleteFolderDraft, clearEnvi
 import { IconAlertTriangle } from '@tabler/icons';
 import Modal from 'components/Modal';
 import Button from 'ui/Button';
+import toast from 'react-hot-toast';
 
 const SaveRequestsModal = ({ onClose, forceCloseTabs = false, tabUidsToClose = [] }) => {
   const MAX_UNSAVED_ITEMS_TO_SHOW = 5;
@@ -166,14 +168,27 @@ const SaveRequestsModal = ({ onClose, forceCloseTabs = false, tabUidsToClose = [
         await dispatch(saveMultipleRequests(requestDrafts));
       }
 
-      // Save all collection environment drafts
-      for (const draft of collectionEnvironmentDrafts) {
-        await dispatch(saveEnvironment(draft.variables, draft.environmentUid, draft.collectionUid));
+      // Save environment drafts, skipping any with invalid variable names
+      const allEnvironmentDrafts = [...collectionEnvironmentDrafts, ...globalEnvironmentDrafts];
+      let hasSkippedEnvs = false;
+
+      for (const draft of allEnvironmentDrafts) {
+        const invalidNames = getInvalidVariableNames(draft.variables);
+        if (invalidNames.length > 0) {
+          hasSkippedEnvs = true;
+          toast.error(`Cannot save "${draft.name}": invalid variable name(s) — ${invalidNames.join(', ')}`);
+          continue;
+        }
+
+        if (draft.type === 'collection-environment') {
+          await dispatch(saveEnvironment(draft.variables, draft.environmentUid, draft.collectionUid));
+        } else {
+          await dispatch(saveGlobalEnvironment({ variables: draft.variables, environmentUid: draft.environmentUid }));
+        }
       }
 
-      // Save all global environment drafts
-      for (const draft of globalEnvironmentDrafts) {
-        await dispatch(saveGlobalEnvironment({ variables: draft.variables, environmentUid: draft.environmentUid }));
+      if (hasSkippedEnvs) {
+        return;
       }
 
       if (forceCloseTabs) {
diff --git a/packages/bruno-app/src/utils/common/regex.spec.js b/packages/bruno-app/src/utils/common/regex.spec.js
index a4ce6eecf..3d8562d87 100644
--- a/packages/bruno-app/src/utils/common/regex.spec.js
+++ b/packages/bruno-app/src/utils/common/regex.spec.js
@@ -1,6 +1,7 @@
 const { describe, it, expect } = require('@jest/globals');
 
 import { sanitizeName, validateName } from './regex';
+import { hasInvalidVariableNames } from './variables';
 
 describe('regex validators', () => {
   describe('sanitize name', () => {
@@ -163,3 +164,85 @@ describe('sanitizeName and validateName', () => {
     });
   });
 });
+
+describe('hasInvalidVariableNames', () => {
+  describe('valid variable names', () => {
+    it('should return false for alphanumeric names with underscores, hyphens, and dots', () => {
+      const validVariables = [
+        { name: 'valid_name', value: 'test' },
+        { name: 'valid-name', value: 'test' },
+        { name: 'valid.name', value: 'test' },
+        { name: 'validName123', value: 'test' }
+      ];
+      expect(hasInvalidVariableNames(validVariables)).toBe(false);
+    });
+
+    it('should return false for empty array (no variables to validate)', () => {
+      expect(hasInvalidVariableNames([])).toBe(false);
+    });
+  });
+
+  describe('invalid variable names', () => {
+    it('should return true for variable names with unicode letters (not in \\w)', () => {
+      const variables = [{ name: 'válid_ñame', value: 'test' }];
+      expect(hasInvalidVariableNames(variables)).toBe(true);
+    });
+
+    it('should return true for variable names containing spaces', () => {
+      const variables = [{ name: 'invalid name', value: 'test' }];
+      expect(hasInvalidVariableNames(variables)).toBe(true);
+    });
+
+    it('should return true for variable names with special characters', () => {
+      const invalidVariables = [
+        { name: 'invalid@name', value: 'test' },
+        { name: 'invalid!name', value: 'test' },
+        { name: 'invalid#name', value: 'test' },
+        { name: 'invalid$name', value: 'test' }
+      ];
+      invalidVariables.forEach((variable) => {
+        expect(hasInvalidVariableNames([variable])).toBe(true);
+      });
+    });
+
+    it('should return true if any variable in array has invalid name', () => {
+      const mixedVariables = [
+        { name: 'valid_name', value: 'test' },
+        { name: 'invalid name', value: 'test' },
+        { name: 'another_valid', value: 'test' }
+      ];
+      expect(hasInvalidVariableNames(mixedVariables)).toBe(true);
+    });
+  });
+
+  describe('empty/placeholder variable names (skipped)', () => {
+    it('should skip variables with empty names (placeholder rows in UI)', () => {
+      const variables = [
+        { name: '', value: 'test' },
+        { name: '   ', value: 'test' }
+      ];
+      expect(hasInvalidVariableNames(variables)).toBe(false);
+    });
+
+    it('should skip variables without name property', () => {
+      const variables = [
+        { value: 'test' },
+        { name: null, value: 'test' }
+      ];
+      expect(hasInvalidVariableNames(variables)).toBe(false);
+    });
+  });
+
+  describe('defensive handling of invalid inputs', () => {
+    it('should return false for null or undefined (no variables to validate)', () => {
+      expect(hasInvalidVariableNames(null)).toBe(false);
+      expect(hasInvalidVariableNames(undefined)).toBe(false);
+    });
+
+    it('should return false for non-array inputs (defensive check)', () => {
+      expect(hasInvalidVariableNames('string')).toBe(false);
+      expect(hasInvalidVariableNames(123)).toBe(false);
+      expect(hasInvalidVariableNames({})).toBe(false);
+    });
+  });
+});
diff --git a/packages/bruno-app/src/utils/common/variables.js b/packages/bruno-app/src/utils/common/variables.js
new file mode 100644
index 000000000..a0aa7881d
--- /dev/null
+++ b/packages/bruno-app/src/utils/common/variables.js
@@ -0,0 +1,21 @@
+import { variableNameRegex } from './regex';
+
+/**
+ * Returns the list of invalid variable names from a variables array.
+ * Skips empty/placeholder names (empty string or whitespace-only).
+ */
+export const getInvalidVariableNames = (variables) => {
+  if (!variables || !Array.isArray(variables)) return [];
+  return variables
+    .filter((variable) => variable.name && variable.name.trim() !== '' && !variableNameRegex.test(variable.name))
+    .map((variable) => variable.name);
+};
+
+/**
+ * Checks whether any variable in the array has an invalid name.
+ * Uses variableNameRegex from regex.js — names may only contain
+ * word characters (\\w), hyphens, and dots.
+ */
+export const hasInvalidVariableNames = (variables) => {
+  return getInvalidVariableNames(variables).length > 0;
+};