diff --git a/Composer/packages/lib/indexers/__tests__/validations/expressionValidation.test.ts b/Composer/packages/lib/indexers/__tests__/validations/expressionValidation.test.ts
index b064d76fc4..2caef95c2f 100644
--- a/Composer/packages/lib/indexers/__tests__/validations/expressionValidation.test.ts
+++ b/Composer/packages/lib/indexers/__tests__/validations/expressionValidation.test.ts
@@ -13,6 +13,9 @@ describe('search lg custom function', () => {
     expect(result.length).toEqual(2);
     expect(result[0]).toEqual('foo.bar');
     expect(result[1]).toEqual('foo.cool');
+    const lgFilesWithoutOptions = [{ id: 'test.en-us' }];
+    const result1 = searchLgCustomFunction(lgFilesWithoutOptions as LgFile[]);
+    expect(result1.length).toEqual(0);
   });
 
   it('should return custom functions with namespace', () => {
diff --git a/Composer/packages/lib/indexers/src/validations/expressionValidation/index.ts b/Composer/packages/lib/indexers/src/validations/expressionValidation/index.ts
index 3ba6eeabda..aee180ce76 100644
--- a/Composer/packages/lib/indexers/src/validations/expressionValidation/index.ts
+++ b/Composer/packages/lib/indexers/src/validations/expressionValidation/index.ts
@@ -15,16 +15,17 @@ const ExportsKey = '@exports';
 export const searchLgCustomFunction = (lgFiles: LgFile[]): string[] => {
   const customFunctions = lgFiles.reduce((result: string[], lgFile) => {
     const { options } = lgFile;
-    const exports = extractOptionByKey(ExportsKey, options);
-    let namespace = extractOptionByKey(NamespaceKey, options);
-    if (!namespace) namespace = lgFile.id; //if namespace doesn't exist, use file name
-    const funcList = exports.split(',');
-    funcList.forEach((func) => {
-      if (func) {
-        result.push(`${namespace}.${func.trim()}`);
-      }
-    });
-
+    if (options?.length) {
+      const exports = extractOptionByKey(ExportsKey, options);
+      let namespace = extractOptionByKey(NamespaceKey, options);
+      if (!namespace) namespace = lgFile.id; //if namespace doesn't exist, use file name
+      const funcList = exports.split(',');
+      funcList.forEach((func) => {
+        if (func) {
+          result.push(`${namespace}.${func.trim()}`);
+        }
+      });
+    }
     return result;
   }, []);
   return customFunctions;
diff --git a/Composer/packages/lib/shared/src/types/indexers.ts b/Composer/packages/lib/shared/src/types/indexers.ts
index be850e6843..2232466237 100644
--- a/Composer/packages/lib/shared/src/types/indexers.ts
+++ b/Composer/packages/lib/shared/src/types/indexers.ts
@@ -107,7 +107,7 @@ export interface LgFile {
   content: string;
   diagnostics: Diagnostic[];
   templates: LgTemplate[];
-  options: string[];
+  options?: string[];
 }
 
 export interface Skill {