Fixed Fragment Replacement Issue

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomActivity.kt

@@ -86,11 +86,13 @@ class ChatRoomActivity : AppCompatActivity(), HasSupportFragmentInjector {
 
         isChatRoomSubscribed = intent.getBooleanExtra(INTENT_CHAT_IS_SUBSCRIBED, true)
 
+        if (supportFragmentManager.findFragmentByTag("ChatRoomFragment") == null) {
             addFragment("ChatRoomFragment", R.id.fragment_container) {
                 newInstance(chatRoomId, chatRoomName, chatRoomType, isChatRoomReadOnly, chatRoomLastSeen,
                         isChatRoomSubscribed)
             }
         }
+    }
 
     override fun onBackPressed() {
         finishActivity()

app/src/main/java/chat/rocket/android/core/lifecycle/CancelStrategy.kt

@@ -13,8 +13,8 @@ class CancelStrategy @Inject constructor(owner: LifecycleOwner, val jobs: Job) :
         owner.lifecycle.addObserver(this)
     }
 
-    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
-    fun onDestroy() {
+    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
+    fun onStop() {
         jobs.cancel()
     }
 }
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