Maybe that could work...
Or using the UNI command while facing left, though that may result in fake difficulty in that you cannot face right... and the crash occurs when moving right...
This is a pretty tricky predicament, I would say... :-b
Adding the <UNI command didn't change anything, and the mod still crashes if you go right and come into contact with tiles 16.10, 16.11, 16.12, 16.13 and 16.14. This also extends to the other right hand tiles on those rows. This is without putting an Null entity with #0300.
Adding that in, causes Balfrog to move more and summon more mini-Balfrogs. The mod still crashes if you move to the tiles I mentioned.