random menu crash

[Dealga McArdle]

This is the 4th or 5th time this has happened. I can only say that it happens after a 20 minute expedition without having left edit mode to go into object mode. perhap I should include a poll to avoid doing anything until blender can prove that it's ready.

This doesn't appear caused by the addition of icons, as it happened before their introductions.

[Dealga McArdle]

i'm settling for this, though it doesn't guarantee the draw function won't do something scary, despite the the try/except

class VIEW3D_MT_edit_mesh_tinycad(bpy.types.Menu):
    bl_label = "TinyCAD"

    @classmethod
    def poll(cls, context):
        return (context.object is not None)

    def draw(self, context):
        try:
            pcoll = preview_collections["main"]
            for i, text, ico_info in vtx_classes:
                icon_name = ico_info[:-4]
                my_icon = pcoll[icon_name]
                self.layout.operator(i.bl_idname, icon_value=my_icon.icon_id, text=text)
        except:
            print('blender not ready.. try again')