diff --git a/src/blenderbim/blenderbim/bim/module/geometry/helper.py b/src/blenderbim/blenderbim/bim/module/geometry/helper.py
index f68501dd0b..435d008820 100644
--- a/src/blenderbim/blenderbim/bim/module/geometry/helper.py
+++ b/src/blenderbim/blenderbim/bim/module/geometry/helper.py
@@ -265,7 +265,8 @@ class Helper:
 
         inner_loops.remove(outer_loop)
 
-        points = [v.co for v in bm.verts]
+        # Copy vectors to prevent random data mangling after bmesh is freed.
+        points = [Vector(list(v.co)) for v in bm.verts]
 
         bm.to_mesh(mesh)
         mesh.update()