Help with crash caused by procedure

I am trying to make a more robust fishing system and my first step is to recreate the vanilla fishing rod. I have a custom item with the following procedure linked to the "On player stopped using" trigger:

The Bobber entity it refers to has the following procedure linked to its "On active tick" trigger:

Something about these two procedures causes the game to crash after using the fishing rod. I've been staring at this for about 2 hours and I'm sure the fix is something obvious but would appreciate any help y'all could give

Here's a drive folder with the procedures downloadable and the screenshots above in case they need to be zoomed into

https://drive.google.com/drive/folders/1LRdpTA1bp2KJmFYYYZm_0zVSWnHPC_m…