diff --git a/src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java b/src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java
index ee2a15379..863fd5780 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java
@@ -257,6 +257,11 @@ public class ConferenceDetailsActivity extends XmppActivity implements OnConvers
 
     @Override
     public boolean onContextItemSelected(MenuItem item) {
+        final User user = mUserPreviewAdapter.getSelectedUser();
+        if (user == null) {
+            Toast.makeText(this, R.string.unable_to_perform_this_action, Toast.LENGTH_SHORT).show();
+            return true;
+        }
         if (!MucDetailsContextMenuHelper.onContextItemSelected(item, mUserPreviewAdapter.getSelectedUser(), this)) {
             return super.onContextItemSelected(item);
         }
diff --git a/src/main/res/values/strings.xml b/src/main/res/values/strings.xml
index 8a8d31757..a387e9ec5 100644
--- a/src/main/res/values/strings.xml
+++ b/src/main/res/values/strings.xml
@@ -875,4 +875,5 @@
     <string name="not_a_backup_file">The file you selected is not a Conversations backup file</string>
     <string name="account_already_setup">This account has already been setup</string>
     <string name="please_enter_password">Please enter the password for this account</string>
+    <string name="unable_to_perform_this_action">Unable to perform this action</string>
 </resources>