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After i installed more vanilla turret i got a problem, all the mortar doesn't deal damage anymore they can shot but nothing happen after that. Here's the debug log :
System.NullReferenceException: Object reference not set to an instance of an object
  at Verse.Explosion.Tick () [0x00000] in <filename unknown>:0
  at Verse.ExplosionManager.MapComponentTick () [0x00000] in <filename unknown>:0
  at Verse.Map.MapPostTick () [0x00000] in <filename unknown>:0
Verse.Log:Error(String)
Verse.Map:MapPostTick()
Verse.TickManager:DoSingleTick()
Verse.TickManager:TickManagerUpdate()
Verse.Game:Update()
Verse.Root_Play:Update()