diff --git a/AI/BattleAI/BattleEvaluator.cpp b/AI/BattleAI/BattleEvaluator.cpp
index 984d02d5d..7a950309f 100644
--- a/AI/BattleAI/BattleEvaluator.cpp
+++ b/AI/BattleAI/BattleEvaluator.cpp
@@ -623,6 +623,9 @@ bool BattleEvaluator::attemptCastingSpell(const CStack * activeStack)
 
 				for(const auto & unit : allUnits)
 				{
+					if (!unit->isValidTarget())
+						continue;
+					
 					auto newHealth = unit->getAvailableHealth();
 					auto oldHealth = vstd::find_or(healthOfStack, unit->unitId(), 0); // old health value may not exist for newly summoned units