'o00O' as object ID causes fatal...

[Hellohihi]

This is so weird, 'o00O' as object ID for a tower in my map causes the game to fatal error when another tower is selected.

Anybody knows why?

 

[Exide]

I have no idea.
Try putting a zero at the end, and an O (as in Overkill) at the beginning, like this:

'O000'

What is this object?

 

[Hellohihi]

It is an Advanced Tower of Pearls.

I managed to bypass the fatal error by setting its object ID to o00P.