Duplicate particle files are often the issue, but they are not the only things that may be causing your map to crash.
-Do you have a heightmap with the map? If so, have you made sure that all of the details are correct? (513x513 size, Alpha Channel lock removed, flattened any multiple layers, set to Grayscale, etc.)
-Your computer may not be able to handle the amount of objects in the map. If you have many meshes placed inside the map, this could be too much data for you computer to handle.
-It's possible that a corrupt object(s) has been placed in the map. This can often cause the game to crash.
There could be other reasons your game is crashing, but let me know if any of these are the case. c: