03-21 23:33:57.984 23418 23444 E AndroidRuntime: FATAL EXCEPTION: TGNotificationManager                                                                                                                            
03-21 23:33:57.984 23418 23444 E AndroidRuntime: Process: org.thunderdog.challegram, PID: 23418                                                                                                                    
03-21 23:33:57.984 23418 23444 E AndroidRuntime: java.lang.RuntimeException: user must be valid and have a name
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at android.app.Notification$MessagingStyle.<init>(Notification.java:6183)                                                                                  
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at android.app.Notification$MessagingStyle.<init>(Notification.java:6171)                                                                                  
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at android.support.v4.app.NotificationCompat$MessagingStyle.apply(NotificationCompat.java:2181)
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at android.support.v4.app.NotificationCompatBuilder.build(NotificationCompatBuilder.java:183)                                                              
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at android.support.v4.app.NotificationCompat$Builder.build(NotificationCompat.java:1484)                                                                   
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at org.thunderdog.challegram.TGNotification.displayForMessages(TGNotification.java:348)
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at org.thunderdog.challegram.TGNotificationManager.showNotificationInternal(TGNotificationManager.java:2053)                                               
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at org.thunderdog.challegram.TGNotificationManager.updateNotification(TGNotificationManager.java:2044)                                                     
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at org.thunderdog.challegram.TGNotificationManager.restoreStack(TGNotificationManager.java:459)
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at org.thunderdog.challegram.TGNotificationManager.access$000(TGNotificationManager.java:46)                                                               
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at org.thunderdog.challegram.TGNotificationManager$1.process(TGNotificationManager.java:275)                                                               
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at org.thunderdog.challegram.core.BaseThread$BaseThreadHandler.handleMessage(BaseThread.java:101)
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:106)                                                                                                    
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:164)                                                                                                                 
03-21 23:33:57.984 23418 23444 E AndroidRuntime:        at org.thunderdog.challegram.core.BaseThread.run(BaseThread.java:89)