diff --git a/src/middleware/modelInterceptor.ts b/src/middleware/modelInterceptor.ts
index 74d7d15..55aa0f9 100644
--- a/src/middleware/modelInterceptor.ts
+++ b/src/middleware/modelInterceptor.ts
@@ -14,7 +14,7 @@ export const modelInterceptor: Middleware<{}, Record<string, object>> =
       return action.consumer(draft, action);
     });
 
-    action.actionInActionGuard?.();
+    action.actionInActionGuard && action.actionInActionGuard();
 
     if (deepEqual(prev, next)) return action;
 
diff --git a/src/store/modelStore.ts b/src/store/modelStore.ts
index 9b1c200..71fbabe 100644
--- a/src/store/modelStore.ts
+++ b/src/store/modelStore.ts
@@ -132,11 +132,11 @@ export class ModelStore<T = Record<string, any>> extends StoreBasic<T> {
   onInitialized(maybeSync?: () => void): Promise<void> {
     return new Promise((resolve) => {
       if (this._isReady) {
-        maybeSync?.();
+        maybeSync && maybeSync();
         resolve();
       } else {
         this.topic.subscribeOnce('ready', () => {
-          maybeSync?.();
+          maybeSync && maybeSync();
           resolve();
         });
       }