Cheat Engine

[Corruptor]

Im currently fooling around with a map editor, trying to make my map even larger than the map editors ui would let me.
The editor itself has a maximum size of 256x256, by finding a function and changing a local struct in it, i managed to enlarge it to 480x480. If, however, i use anything > 480 (he will "round" it to 512), the editor simply crashes at map creation. And i dont know how, why, and more importantly, >where<. It doesnt create any crash log either (except for the windows one, which is sort of useless).

So, is there any way to determine the instruction that let to the crash?