diff --git a/lib/CCreatureHandler.cpp b/lib/CCreatureHandler.cpp
index 3292317f6..7ac3e6f1b 100644
--- a/lib/CCreatureHandler.cpp
+++ b/lib/CCreatureHandler.cpp
@@ -963,9 +963,6 @@ void CCreatureHandler::loadStackExperience(CCreature * creature, const JsonNode
 {
 	for (const JsonNode &exp : input.Vector())
 	{
-		auto bonus = JsonUtils::parseBonus (exp["bonus"]);
-		bonus->source = Bonus::STACK_EXPERIENCE;
-		bonus->duration = Bonus::PERMANENT;
 		const JsonVector &values = exp["values"].Vector();
 		int lowerLimit = 1;//, upperLimit = 255;
 		if (values[0].getType() == JsonNode::JsonType::DATA_BOOL)
@@ -974,8 +971,14 @@ void CCreatureHandler::loadStackExperience(CCreature * creature, const JsonNode
 			{
 				if(val.Bool())
 				{
+					// parse each bonus separately
+					// we can not create copies since identifiers resolution does not tracks copies
+					// leading to unset identifier values in copies
+					auto bonus = JsonUtils::parseBonus (exp["bonus"]);
+					bonus->source = Bonus::STACK_EXPERIENCE;
+					bonus->duration = Bonus::PERMANENT;
 					bonus->limiter = std::make_shared<RankRangeLimiter>(RankRangeLimiter(lowerLimit));
-					creature->addNewBonus (std::make_shared<Bonus>(*bonus)); //bonuses must be unique objects
+					creature->addNewBonus (bonus);
 					break; //TODO: allow bonuses to turn off?
 				}
 				++lowerLimit;
@@ -988,9 +991,14 @@ void CCreatureHandler::loadStackExperience(CCreature * creature, const JsonNode
 			{
 				if (val.Float() != lastVal)
 				{
-					bonus->val = static_cast<int>(val.Float()) - lastVal;
+					JsonNode bonusInput = exp["bonus"];
+					bonusInput["val"].Float() = static_cast<int>(val.Float()) - lastVal;
+
+					auto bonus = JsonUtils::parseBonus (bonusInput);
+					bonus->source = Bonus::STACK_EXPERIENCE;
+					bonus->duration = Bonus::PERMANENT;
 					bonus->limiter.reset (new RankRangeLimiter(lowerLimit));
-					creature->addNewBonus (std::make_shared<Bonus>(*bonus));
+					creature->addNewBonus (bonus);
 				}
 				lastVal = static_cast<int>(val.Float());
 				++lowerLimit;