diff --git a/endpoints/trigger.py b/endpoints/trigger.py
index 2bcdc6242..311c6aaf5 100644
--- a/endpoints/trigger.py
+++ b/endpoints/trigger.py
@@ -244,7 +244,11 @@ class BitbucketBuildTrigger(BuildTriggerHandler):
   def _get_authorized_client(self):
     base_client = self._get_client()
     auth_token = self.auth_token or 'invalid:invalid'
-    (access_token, access_token_secret) = auth_token.split(':')
+    token_parts = auth_token.split(':')
+    if len(token_parts) != 2:
+      token_parts = ['invalid', 'invalid']
+
+    (access_token, access_token_secret) = token_parts
     return base_client.get_authorized_client(access_token, access_token_secret)
 
   def _get_repository_client(self):