glTF exporter: fix morph target import when named 'basis' (is a special name in Blender)

io_scene_gltf2/__init__.py

@@ -15,7 +15,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (1, 6, 11),
+    "version": (1, 6, 12),
     'blender': (2, 91, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/imp/gltf2_blender_gltf.py

@@ -165,7 +165,7 @@ class BlenderGlTF():
         # Calculate names for each mesh's shapekeys
         for mesh in gltf.data.meshes or []:
             mesh.shapekey_names = []
-            used_names = set()
+            used_names = set(['Basis']) #Be sure to not use 'Basis' name at import, this is a reserved name
 
             # Some invalid glTF files has empty primitive tab
             if len(mesh.primitives) > 0: