diff --git a/src/validate.py b/src/validate.py
index 7c020e1..55225e9 100644
--- a/src/validate.py
+++ b/src/validate.py
@@ -55,7 +55,7 @@ def check_and_validate_against_owlboard(train_entries):
             output.append(train_entry)
 
         # Else if only one possible entry (and previous statements false), open issue
-        elif len(train_entry['timetable_entries']) == 1:
+        elif len(train_entry['timetable_entries'] and train_entry['diagram_pis_code'] != "____") == 1:
             issue_title = f"PIS Error | Code: {train_entry['diagram_pis_code']}"
             issue_content = f"""
 PIS Code {train_entry['diagram_pis_code']}.