Game crashes when using PLAYER_LIFETIME variables

I'm creating an underwater vehicle, and in order to make it move I'm using PLAYER_LIFETIME variables assigned to the player, that are used to change whether or not the vehicle should move up, down or horizontally in the direction the player is looking. However, when loading up my testing world to see if it works, the game crashed instantly when loading. Here is the crash log: https://drive.google.com/file/d/1wf_P8AR7IEAWdykavjDLAwZ4u1Yt-B64/view?usp=sharing

Any help would be appreciatted.