diff -r 8b40b2335e5b -r 1f517a461c33 project_files/HedgewarsMobile/Classes/MissionTrainingViewController.m
--- a/project_files/HedgewarsMobile/Classes/MissionTrainingViewController.m	Fri Nov 06 04:34:29 2015 +0100
+++ b/project_files/HedgewarsMobile/Classes/MissionTrainingViewController.m	Mon Nov 09 02:42:30 2015 +0100
@@ -267,7 +267,6 @@
 
 -(void) didReceiveMemoryWarning
 {
-    self.previewImage = nil;
     self.missionName = nil;
     self.listOfMissionIDs = nil;
     self.dictOfMissions = nil;