Fix output schema type not defined (#11788)

Fixes https://github.com/twentyhq/twenty/issues/11778

packages/twenty-front/src/modules/workflow/workflow-variables/utils/__tests__/searchVariableThroughOutputSchema.test.ts

@@ -61,6 +61,19 @@ const mockStep = {
 } satisfies StepOutputSchema;
 
 describe('searchVariableThroughOutputSchema', () => {
+  it('should not break with wrong path', () => {
+    const result = searchVariableThroughOutputSchema({
+      stepOutputSchema: mockStep,
+      rawVariableName: '{{step-1.wrong.wrong.wrong}}',
+      isFullRecord: false,
+    });
+
+    expect(result).toEqual({
+      variableLabel: undefined,
+      variablePathLabel: 'Step 1 > undefined',
+    });
+  });
+
   it('should find a company field variable', () => {
     const result = searchVariableThroughOutputSchema({
       stepOutputSchema: mockStep,

packages/twenty-front/src/modules/workflow/workflow-variables/utils/searchVariableThroughOutputSchema.ts

@@ -47,7 +47,9 @@ const searchCurrentStepOutputSchema = ({
   let variablePathLabel = stepOutputSchema.name;
 
   while (nextKeyIndex < path.length) {
-    if (isRecordOutputSchema(currentSubStep)) {
+    if (!isDefined(currentSubStep)) {
+      break;
+    } else if (isRecordOutputSchema(currentSubStep)) {
       const currentField = currentSubStep.fields[nextKey];
       currentSubStep = currentField?.value;
       nextKey = path[nextKeyIndex + 1];