diff --git a/frontend/public/components/__tests__/edit-yaml.spec.tsx b/frontend/public/components/__tests__/edit-yaml.spec.tsx
new file mode 100644
index 00000000000..3616b60b8a0
--- /dev/null
+++ b/frontend/public/components/__tests__/edit-yaml.spec.tsx
@@ -0,0 +1,48 @@
+import { renderHook } from '@testing-library/react';
+import { useRef } from 'react';
+import type { CodeEditorRef } from '../../module/k8s';
+
+describe('EditYAML: getEditor function', () => {
+  it('should handle undefined monacoRef.current without throwing TypeError', () => {
+    // This test verifies the fix for OCPBUGS-77912
+    // The bug occurred when monacoRef.current was undefined and the 'in' operator was used
+    const { result } = renderHook(() => useRef<CodeEditorRef>());
+    const monacoRef = result.current;
+
+    // This simulates the getEditor function from edit-yaml.tsx
+    const getEditor = () =>
+      monacoRef?.current && 'editor' in monacoRef.current ? monacoRef.current.editor : undefined;
+
+    // Before the fix, this would throw: "TypeError: Cannot use 'in' operator to search for 'editor' in undefined"
+    // After the fix, it should return undefined gracefully
+    expect(() => getEditor()).not.toThrow();
+    expect(getEditor()).toBeUndefined();
+  });
+
+  it('should return undefined when monacoRef.current exists but has no editor property', () => {
+    const { result } = renderHook(() => useRef<CodeEditorRef>());
+    const monacoRef = result.current;
+
+    // Set monacoRef.current to an object without an 'editor' property
+    monacoRef.current = {} as CodeEditorRef;
+
+    const getEditor = () =>
+      monacoRef?.current && 'editor' in monacoRef.current ? monacoRef.current.editor : undefined;
+
+    expect(getEditor()).toBeUndefined();
+  });
+
+  it('should return the editor when monacoRef.current has an editor property', () => {
+    const { result } = renderHook(() => useRef<CodeEditorRef>());
+    const monacoRef = result.current;
+
+    const mockEditor = { getValue: jest.fn(), setValue: jest.fn() };
+    // Set monacoRef.current to an object with an 'editor' property
+    monacoRef.current = { editor: mockEditor } as any;
+
+    const getEditor = () =>
+      monacoRef?.current && 'editor' in monacoRef.current ? monacoRef.current.editor : undefined;
+
+    expect(getEditor()).toBe(mockEditor);
+  });
+});
diff --git a/frontend/public/components/edit-yaml.tsx b/frontend/public/components/edit-yaml.tsx
index 22471bf04e3..7e9b5734791 100644
--- a/frontend/public/components/edit-yaml.tsx
+++ b/frontend/public/components/edit-yaml.tsx
@@ -200,7 +200,7 @@ const EditYAMLInner: FC<EditYAMLInnerProps> = (props) => {
   const { t } = useTranslation();
 
   const getEditor = (): editor.IStandaloneCodeEditor | undefined =>
-    'editor' in monacoRef?.current ? monacoRef.current.editor : undefined;
+    monacoRef?.current && 'editor' in monacoRef.current ? monacoRef.current.editor : undefined;
 
   const getModel = useCallback(
     (obj) => {