diff --git a/src/netcup_dns/main.py b/src/netcup_dns/main.py
index 129df15..e797630 100644
--- a/src/netcup_dns/main.py
+++ b/src/netcup_dns/main.py
@@ -25,9 +25,9 @@ def main():
 
     cfg_files = [file for file in cfg_dir.iterdir() if file.name.endswith('.json') and file.is_file()]
     for cfg_file in cfg_files:
-        cfg = json.loads(cfg_file.read_text())
+        cfg: dict = json.loads(cfg_file.read_text())
 
-        if len(cfg) == 0 or cfg['disabled'] is True:
+        if len(cfg) == 0 or ('disabled' in cfg and cfg['disabled'] is True):
             # Skip empty or disabled configuration file.
             continue