diff --git a/yacv_server/yacv.py b/yacv_server/yacv.py
index 1805c48..5ac87a0 100644
--- a/yacv_server/yacv.py
+++ b/yacv_server/yacv.py
@@ -325,9 +325,10 @@ _find_var_name_count = 0
 def _find_var_name(obj: any, avoid_levels: int = 2) -> str:
     """A hacky way to get a stable name for an object that may change over time"""
     global _find_var_name_count
+    obj_shape = get_shape(obj)
     for frame in inspect.stack()[avoid_levels:]:
         for key, value in frame.frame.f_locals.items():
-            if get_shape(value) is get_shape(obj):
+            if get_shape(value, error=False) is obj_shape:
                 return key
     _find_var_name_count += 1
     return 'unknown_var_' + str(_find_var_name_count)