diff --git a/__init__.py b/__init__.py
index c601100..c5bcbd2 100644
--- a/__init__.py
+++ b/__init__.py
@@ -99,6 +99,8 @@ def calendarCredentials(token = None):
     
 def updateCalendars(user, calendars, colors):
     
+    if user == None or calendars == None or colors == None:
+        return
     COLORS_FILE = os.path.join(os.path.dirname(__file__), 'colors.json')
     with open(COLORS_FILE) as f:
         colormap = json.load(f)