diff --git a/passerelle/contrib/tcl/models.py b/passerelle/contrib/tcl/models.py
index 3f94c9b4..e4ca1123 100644
--- a/passerelle/contrib/tcl/models.py
+++ b/passerelle/contrib/tcl/models.py
@@ -187,7 +187,7 @@ class Line(models.Model):
         }
 
     def save(self, *args, **kwargs):
-        if not self.couleur:
+        if not self.couleur or self.couleur == 'None':
             self.couleur = '255 255 255'
         self.html_bg_color = '%02x%02x%02x' % tuple(int(x) for x in self.couleur.split())
         self.html_fg_color = self.get_foreground_colour(self.html_bg_color)