--- a/project_files/HedgewarsMobile/Classes/MissionTrainingViewController.m	Sun Dec 06 20:35:58 2015 +0300
+++ b/project_files/HedgewarsMobile/Classes/MissionTrainingViewController.m	Sun Dec 06 20:36:21 2015 +0300
@@ -267,7 +267,6 @@
 
 -(void) didReceiveMemoryWarning
 {
-    self.previewImage = nil;
     self.missionName = nil;
     self.listOfMissionIDs = nil;
     self.dictOfMissions = nil;