fix some NPE

1 files changed, 16 insertions, 14 deletions

diff --git a/src/main/java/de/pixart/messenger/ui/ConferenceDetailsActivity.java b/src/main/java/de/pixart/messenger/ui/ConferenceDetailsActivity.java
index 8ac8868fc..0840fc3fc 100644
--- a/src/main/java/de/pixart/messenger/ui/ConferenceDetailsActivity.java
+++ b/src/main/java/de/pixart/messenger/ui/ConferenceDetailsActivity.java
@@ -221,20 +221,22 @@ public class ConferenceDetailsActivity extends XmppActivity implements OnConvers
         this.mAdvancedMode = getPreferences().getBoolean("advanced_muc_mode", false);
         this.binding.mucInfoMore.setVisibility(this.mAdvancedMode ? View.VISIBLE : View.GONE);
         this.binding.notificationStatusButton.setOnClickListener(this.mNotifyStatusClickListener);
-        this.binding.detailsMucAvatar.setOnClickListener(v -> {
-            final MucOptions mucOptions = mConversation.getMucOptions();
-            if (!mucOptions.hasVCards()) {
-                Toast.makeText(this, R.string.host_does_not_support_group_chat_avatars, Toast.LENGTH_SHORT).show();
-                return;
-            }
-            if (!mucOptions.getSelf().getAffiliation().ranks(MucOptions.Affiliation.OWNER)) {
-                Toast.makeText(this, R.string.only_the_owner_can_change_group_chat_avatar, Toast.LENGTH_SHORT).show();
-                return;
-            }
-            final Intent intent = new Intent(this, PublishGroupChatProfilePictureActivity.class);
-            intent.putExtra("uuid", mConversation.getUuid());
-            startActivity(intent);
-        });
+        if (mConversation != null) {
+            this.binding.detailsMucAvatar.setOnClickListener(v -> {
+                final MucOptions mucOptions = mConversation.getMucOptions();
+                if (!mucOptions.hasVCards()) {
+                    Toast.makeText(this, R.string.host_does_not_support_group_chat_avatars, Toast.LENGTH_SHORT).show();
+                    return;
+                }
+                if (!mucOptions.getSelf().getAffiliation().ranks(MucOptions.Affiliation.OWNER)) {
+                    Toast.makeText(this, R.string.only_the_owner_can_change_group_chat_avatar, Toast.LENGTH_SHORT).show();
+                    return;
+                }
+                final Intent intent = new Intent(this, PublishGroupChatProfilePictureActivity.class);
+                intent.putExtra("uuid", mConversation.getUuid());
+                startActivity(intent);
+            });
+        }
         this.binding.editMucNameButton.setOnClickListener(this::onMucEditButtonClicked);
         this.binding.mucEditTitle.addTextChangedListener(this);
         this.binding.mucEditSubject.addTextChangedListener(this);