projectile's "Level field" is null?

Hi, I've been working on my mod right, and I ran into a problem with the projectile procedure block. Whenever  I use this procedure block in my situation, it crashes the game.

I'm trying to make a block, when right-clicked, it spawns an armor stand that then shoots a projectile, and then it despawns the armor stand.
But as I said, the procedure blocks (the pink one I believe) shooter field is returning null which then crashes the game.

here is the crash report, if anyone can help, please do!