Mr.Hotkeys

I made a simple mod for Sentinals that basically made every item a dollar, as well as adding a couple of items (ie Boris Uniform, Katana) to the shop and spawning ten of every item every round, even the items that don't come until later in the game. Everything runs fine and as intended on the first three missions, on the mission where you assassinate the scientist, and on the very first part of the mission with the archives in the mine. However as soon as you enter the mine or try to load the mission with the missiles, the game crashes while loading the level. Does anyone have any experience with problems like this and have any advice? It would be greatly appreciated.