diff --git a/acmc/phen.py b/acmc/phen.py
index d2a1787e3f654be3bc441749f63415377ce98f34..abea461983b3adc8bdb3b99808cbd9f7261d1315 100644
--- a/acmc/phen.py
+++ b/acmc/phen.py
@@ -735,7 +735,7 @@ def _write_code_errors(code_errors: list, code_errors_path: Path):
                 "SOURCE": err.codes_file,
                 "CAUSE": err.message,
             }
-            for err in code_errors
+            for err in code_errors if err.mask is not None
         ]
     )