core::string destructor is crashing

[CuteAlien]

Chances are pretty high that the problem is in another place. For example the string is in some other class and that other class object is invalid that point. For such bugs you have to reduce the problem until you have only a tiny program left which still contains the bug (divide&conquer!). Then you can post that tiny program (which should still compile, but not contain any line anymore which isn't removable while keeping the bug) so others can look at it. Thought usually you find the problem yourself while reducing code like that :-)