diff --git a/passerelle/contrib/tcl/models.py b/passerelle/contrib/tcl/models.py
index bacfaf8c..ac2c5a97 100644
--- a/passerelle/contrib/tcl/models.py
+++ b/passerelle/contrib/tcl/models.py
@@ -80,7 +80,9 @@ class Tcl(BaseResource):
                     break
             stop['passings'].append(passing)
             # create dictionary key from both line number and direction
-            line_info_key = passing['line_info']['ligne'] + '-' + passing['direction']
+            line_info_key = passing['line_info']['ligne']
+            if passing.get('direction'):
+                line_info_key += '-' + passing['direction']
             if line_info_key not in passings_by_line:
                 passings_by_line[line_info_key] = []
             passings_by_line[line_info_key].append(passing)