diff --git a/parse.py b/parse.py
index a46e401..8a0e8ed 100755
--- a/parse.py
+++ b/parse.py
@@ -312,11 +312,13 @@ cal.add('version', '2.0')
 cal.add('calscale', 'GREGORIAN')
 cal.add('x-wr-calname', 'Polytech IMA ' + str(args.annee) + ' ' + args.edt)
 
-if os.path.isfile('custom.py'):
+try:
     import custom
     for event in events:
         if event.active:
             custom.filterEvent(event)
+except ImportError:
+    pass
 
 for event in events:
     if event.active:
--
libgit2 0.21.2