Check if user exists in is_user_present

This method may be called before an external user is fetched, so it
doesn't exist yet.

1 files changed, 1 insertions, 1 deletions

diff --git a/wee_slack.py b/wee_slack.py
index f61168e..f4e3786 100644
--- a/wee_slack.py
+++ b/wee_slack.py
@@ -1097,7 +1097,7 @@ class SlackTeam(object):
 
     def is_user_present(self, user_id):
         user = self.users.get(user_id)
-        if user.presence == 'active':
+        if user and user.presence == 'active':
             return True
         else:
             return False