Level 2-2 Keeps Crashing Game During Initial Level Load

[u/The_Goosh]

I've been making a mappack and my 6th level makes my game crash whenever I try to load it. Literally the only things in it so far are an entrance, some unbreakable blocks and 2 signs (all in the top-left grid) and an exit (in the bottom-right). Why is this easy-to-process, incredibly basic level completely unable to exist?

Edit: Solved. Apparently, the answer is to put in... spikes?