I wonder how this survived so long in Blender... (2005/03/09 commit). Reason was the call to BPY_free_screen_spacehandlers(sc) in kernel, which was freeing up scripthandlers in a weird way. That call is really obsolete. The real freeing should go in the del_area() call, to prevent copying and deleting area in the UI to go wrong. (Crash happened in testing timeline markers, and holding CTRL+Uparrow a while...)
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55 KiB