Crashing everytime with "Get owner of" procedure

I'm making a mod that focuses on getting characters, and when they kill an enemy, the player earns money, but for that, I need the procedure "Get owner of", I already checked if the entity is tamed and if the player is the owner, but my Mcreator crashes when I use "Get owner of". (sorry for bad English)

here is a part of the procedure: https://imgur.com/a/96c5HLu