diff --git a/src/helper.py b/src/helper.py
index d110a95..333b23b 100644
--- a/src/helper.py
+++ b/src/helper.py
@@ -205,7 +205,11 @@ def giteaGetAllUsersOrgs(type):
 
 
 def isBlacklistedRepository(full_name):
-    for pattern in config['blacklist']:
+    blacklist = config.get('blacklist', [])
+    if isinstance(blacklist, str):
+        blacklist = [blacklist]
+
+    for pattern in blacklist:
         if fnmatch.fnmatch(full_name, pattern):
             return True
     return False