diff --git a/app/src/main/java/com/nextcloud/talk/call/CallParticipantList.java b/app/src/main/java/com/nextcloud/talk/call/CallParticipantList.java
index 4a1c7370bf..4b3727aa47 100644
--- a/app/src/main/java/com/nextcloud/talk/call/CallParticipantList.java
+++ b/app/src/main/java/com/nextcloud/talk/call/CallParticipantList.java
@@ -86,8 +86,8 @@ private void processParticipantList(List<Participant> participants) {
                 callParticipants.remove(callParticipant.getSessionId());
                 // No need to copy it, as it will be no longer used.
                 callParticipant.setInCall(Participant.InCallFlags.DISCONNECTED);
-                left.add(callParticipant);
             }
+            left.addAll(knownCallParticipantsNotFound);
 
             if (!joined.isEmpty() || !updated.isEmpty() || !left.isEmpty()) {
                 callParticipantListNotifier.notifyChanged(joined, updated, left, unchanged);
diff --git a/app/src/main/java/com/nextcloud/talk/presenters/MentionAutocompletePresenter.java b/app/src/main/java/com/nextcloud/talk/presenters/MentionAutocompletePresenter.java
index 9ec1f67e39..5d5f206990 100644
--- a/app/src/main/java/com/nextcloud/talk/presenters/MentionAutocompletePresenter.java
+++ b/app/src/main/java/com/nextcloud/talk/presenters/MentionAutocompletePresenter.java
@@ -126,28 +126,33 @@ public void onSubscribe(@NonNull Disposable d) {
 
                 @Override
                 public void onNext(@NonNull MentionOverall mentionOverall) {
-                    List<Mention> mentionsList = mentionOverall.getOcs().getData();
-
-                    if (mentionsList.size() == 0) {
-                        adapter.clear();
-                    } else {
-                        List<AbstractFlexibleItem> internalAbstractFlexibleItemList =
-                            new ArrayList<>(mentionsList.size());
-                        for (Mention mention : mentionsList) {
-                            internalAbstractFlexibleItemList.add(
-                                new MentionAutocompleteItem(
-                                    mention,
-                                    currentUser,
-                                    context,
-                                    roomToken,
-                                    viewThemeUtils));
+                    if (mentionOverall.getOcs() != null) {
+                        List<Mention> mentionsList = mentionOverall.getOcs().getData();
+
+                        if (mentionsList != null) {
+
+                            if (mentionsList.isEmpty()) {
+                                adapter.clear();
+                            } else {
+                                List<AbstractFlexibleItem> internalAbstractFlexibleItemList =
+                                    new ArrayList<>(mentionsList.size());
+                                for (Mention mention : mentionsList) {
+                                    internalAbstractFlexibleItemList.add(
+                                        new MentionAutocompleteItem(
+                                            mention,
+                                            currentUser,
+                                            context,
+                                            roomToken,
+                                            viewThemeUtils));
+                                }
+
+                                if (adapter.getItemCount() != 0) {
+                                    adapter.clear();
+                                }
+
+                                adapter.updateDataSet(internalAbstractFlexibleItemList);
+                            }
                         }
-
-                        if (adapter.getItemCount() != 0) {
-                            adapter.clear();
-                        }
-
-                        adapter.updateDataSet(internalAbstractFlexibleItemList);
                     }
                 }
 
diff --git a/app/src/main/java/com/nextcloud/talk/ui/dialog/ChooseAccountDialogFragment.java b/app/src/main/java/com/nextcloud/talk/ui/dialog/ChooseAccountDialogFragment.java
index 8e53821479..729fa51816 100644
--- a/app/src/main/java/com/nextcloud/talk/ui/dialog/ChooseAccountDialogFragment.java
+++ b/app/src/main/java/com/nextcloud/talk/ui/dialog/ChooseAccountDialogFragment.java
@@ -109,7 +109,7 @@ public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
 
         themeViews();
         setupCurrentUser(user);
-        setupListeners(user);
+        setupListeners();
         setupAdapter();
         prepareViews();
     }
@@ -220,7 +220,7 @@ private void addAccountToSwitcherList(
         adapter.updateDataSet(userItems, false);
     }
 
-    private void setupListeners(User user) {
+    private void setupListeners() {
         // Creating listeners for quick-actions
         binding.currentAccount.getRoot().setOnClickListener(v -> dismiss());
 
@@ -240,7 +240,7 @@ private void setupListeners(User user) {
         binding.setStatus.setOnClickListener(v -> {
             dismiss();
 
-            if (status != null) {
+            if (status != null && getActivity() != null) {
                 SetStatusDialogFragment setStatusDialog = SetStatusDialogFragment.newInstance(status);
                 setStatusDialog.show(getActivity().getSupportFragmentManager(), "fragment_set_status");
             } else {