diff --git a/src/server/scripts/Spells/spell_generic.cpp b/src/server/scripts/Spells/spell_generic.cpp
index f20322ce0fe..7ffd658edd1 100644
--- a/src/server/scripts/Spells/spell_generic.cpp
+++ b/src/server/scripts/Spells/spell_generic.cpp
@@ -3052,17 +3052,15 @@ class spell_gen_seaforium_blast : public SpellScriptLoader
 
             bool Load() override
             {
-                // OriginalCaster is always available in Spell::prepare
-                return GetOriginalCaster()->GetTypeId() == TYPEID_PLAYER;
+                return GetGObjCaster()->GetOwnerGUID().IsPlayer();
             }
 
             void AchievementCredit(SpellEffIndex /*effIndex*/)
             {
-                // but in effect handling OriginalCaster can become nullptr
-                if (Unit* originalCaster = GetOriginalCaster())
+                if (Unit* owner = GetGObjCaster()->GetOwner())
                     if (GameObject* go = GetHitGObj())
                         if (go->GetGOInfo()->type == GAMEOBJECT_TYPE_DESTRUCTIBLE_BUILDING)
-                            originalCaster->CastSpell(originalCaster, SPELL_PLANT_CHARGES_CREDIT_ACHIEVEMENT, true);
+                            owner->CastSpell(nullptr, SPELL_PLANT_CHARGES_CREDIT_ACHIEVEMENT, true);
             }
 
             void Register() override