Fix crash on quit

space_view3d_virtual_reality/hmd/__init__.py

@@ -151,7 +151,8 @@ class HMD_Base:
         """
         try:
             for i in range(2):
-                gpu.offscreen_object_free(self._offscreen_object[i])
+                if self._offscreen_object[i]:
+                    gpu.offscreen_object_free(self._offscreen_object[i])
 
         except Exception as E:
             print(E)

space_view3d_virtual_reality/operator.py

@@ -87,7 +87,7 @@ class VirtualRealityDisplayOperator(bpy.types.Operator):
                 return {'RUNNING_MODAL'}
             else:
                 # quit right away
-                wm.virtual_reality.is_enabled = False
+                vr.is_enabled = False
                 self._quit(context)
                 self.report({'ERROR'}, "Error initializing device")