diff --git a/src/server/game/Instances/InstanceScript.cpp b/src/server/game/Instances/InstanceScript.cpp
index 6da098da8..21413f716 100644
--- a/src/server/game/Instances/InstanceScript.cpp
+++ b/src/server/game/Instances/InstanceScript.cpp
@@ -338,10 +338,11 @@ bool InstanceScript::SetBossState(uint32 id, EncounterState state)
     return false;
 }
 
-std::string InstanceScript::LoadBossState(const char* data)
+void InstanceScript::LoadBossState(const char* data)
 {
     if (!data)
-        return nullptr;
+        return;
+
     std::istringstream loadStream(data);
     uint32 buff;
     uint32 bossId = 0;
@@ -351,7 +352,6 @@ std::string InstanceScript::LoadBossState(const char* data)
         if (buff < TO_BE_DECIDED)
             SetBossState(bossId, (EncounterState)buff);
     }
-    return loadStream.str();
 }
 
 std::string InstanceScript::GetBossSaveData()
diff --git a/src/server/game/Instances/InstanceScript.h b/src/server/game/Instances/InstanceScript.h
index 9ba662267..f294bf2a3 100644
--- a/src/server/game/Instances/InstanceScript.h
+++ b/src/server/game/Instances/InstanceScript.h
@@ -271,7 +271,7 @@ protected:
     void UpdateDoorState(GameObject* door);
     void UpdateMinionState(Creature* minion, EncounterState state);
 
-    std::string LoadBossState(char const* data);
+    void LoadBossState(char const* data);
     std::string GetBossSaveData();
 private:
     static void LoadObjectData(ObjectData const* creatureData, ObjectInfoMap& objectInfo);