fix [#27916] Crash adding EdgeSplit/Bevel modifier to imported lwo mesh

io_import_scene_lwo.py

@@ -1193,6 +1193,12 @@ def build_objects(object_layers, object_surfs, object_tags, object_name, add_sub
         layer_data.morphs.clear()
         layer_data.surf_tags.clear()
 
+        # We may have some invalid mesh data, See: [#27916]
+        # keep this last!
+        print("validating mesh: %r..." % me.name)
+        me.validate(verbose=1)
+        print("done!")
+
     # With the objects made, setup the parents and re-adjust the locations.
     for ob_key in ob_dict:
         if ob_dict[ob_key][1] != -1 and ob_dict[ob_key][1] in ob_dict: