GHPython in GH 0.0.0076 (Rhino 5) keeps crashing after I tried to read a script with GHPython from GH 1.0.0005 (Rhino 6)

Until last week I could work with both versions of Rhino/GH. However, yesterday I used GH 0.0.0076 to open a definition with GHPython created in GH 1.0.0005. It crashed. Since then, every attempt to load GHPython in GH 0.0.0076 by inserting a new GHPython component or by loading any file with the GHPython (old or new) crashes Rhino 5.