diff --git a/mev_inspect/classifiers/specs/zero_ex.py b/mev_inspect/classifiers/specs/zero_ex.py
index 4338ace..3c117fe 100644
--- a/mev_inspect/classifiers/specs/zero_ex.py
+++ b/mev_inspect/classifiers/specs/zero_ex.py
@@ -231,7 +231,10 @@ def _get_taker_token_in_amount(
     child_transfers: List[Transfer],
 ) -> int:
 
-    if len(child_transfers) != 2 and trace.error == None:
+    if trace.error is not None:
+        return 0
+
+    if len(child_transfers) != 2:
         raise ValueError(
             f"A settled order should consist of 2 child transfers, not {len(child_transfers)}."
         )