diff --git a/projects/notification-electron/src/lib/services/notification.service.ts b/projects/notification-electron/src/lib/services/notification.service.ts
index 11c0f0b..86471a1 100644
--- a/projects/notification-electron/src/lib/services/notification.service.ts
+++ b/projects/notification-electron/src/lib/services/notification.service.ts
@@ -170,8 +170,8 @@ export class NotificationService {
   constructor(options?: DefaultOptions) {
     this.__defaultOptions = _.assignIn(defaultOptions, options);
     this.__windowPooler = new WindowPooler(
-      !!this.__defaultOptions.windowPool!.min
-        ? this.__defaultOptions.windowPool!.min
+      !!this.__defaultOptions.windowPool?.min
+        ? this.__defaultOptions.windowPool?.min
         : 0
     );
     this.__basePosition = {x: 0, y: 0};