fix

app/Listeners/TweetAcceptedListener.php

@@ -32,6 +32,9 @@ class TweetAcceptedListener implements ShouldQueue
     {
         $tweet = $event->tweet;
 
+        if(!$tweet->team || !$tweet->mission)
+            return;
+
         // Tweet out when missions are completed
         $newMissionStatus = $tweet->mission->complete($tweet->team);
         if($event->previousMissionStatus == false && $newMissionStatus == true) {