diff --git a/routerbackup b/routerbackup
index 1530074..9e01cf2 100755
--- a/routerbackup
+++ b/routerbackup
@@ -365,6 +365,11 @@ class AsaConfig(Config):
         self.config = '\n'.join(shrun)
         self.extra['iproute']['content'] = '\n'.join(iproute)
 
+    def is_bad_config(self):
+        super().is_bad_config()
+        if not re.search(': end', self.config):
+            return "does not contain ': end'."
+        return False
 
 def setup_logging(hostname, logfile, loglevel):
     handler = logging.FileHandler(logfile, 'a')