[Mauzen]

16000000 bytes stack/heap is about 1000 times more than most servers will ever need. There are just very few scenarios that would need a stack that big. It doesnt cause any problems when its too big afaik, but you waste 16mb ram for absolutely nothing, rather go with the standard sizes, and rely on the shown estimated maximum. When theres no estimation available like in your case, try to estimate the needed stack size for the biggest recursion yourself and double that. Eventually increase the stack if you get errors, but just setting it to such a giant number without real reasons isnt a clever way to go.

The reason for your problems perhaps is the error, as nero_3d already said, not the stack size.