diff --git a/app/src/main/java/org/kiwix/kiwixmobile/wifi_hotspot/HotspotService.java b/app/src/main/java/org/kiwix/kiwixmobile/wifi_hotspot/HotspotService.java
index fef2348c1..109ebc409 100644
--- a/app/src/main/java/org/kiwix/kiwixmobile/wifi_hotspot/HotspotService.java
+++ b/app/src/main/java/org/kiwix/kiwixmobile/wifi_hotspot/HotspotService.java
@@ -182,7 +182,7 @@ public class HotspotService extends Service {
     }
   }
 
-  public void registerCallBack(@NonNull ServerStateListener myCallback) {
+  public void registerCallBack(@Nullable ServerStateListener myCallback) {
     serverStateListener = myCallback;
   }
 }