It doesn't work properly

[JinxLaJoker]

when using the script it makes all the shape keys into there own mesh and when looking back onto the meth it deleted some of the shape keys

[przemir]

Deleted shape key or deleted shape key content?
I found that even without using script deleting last keyshape could change mesh. And solution (or rather hack-fix) to this is to change to edit mode and return to object mode. I have committed changes to script.