In demo on my end, exit with four (4) actors works fine, what are the rest of the map settings.
Viewing post in how to quickly setup the turnbase tactical battle system?
The reason for the forced close when you have a certain number of actors placed is because there is a plugin calling for the scene to "pop" or exit.
There is no scene pop function in the tactical battle system as it used the map scene itself and as such is avoided.
Please disable your plugins individually until you see a difference.