diff --git a/secop/server.py b/secop/server.py
index 227dbba..c9be71b 100644
--- a/secop/server.py
+++ b/secop/server.py
@@ -260,7 +260,7 @@ class Server:
                     self.modules[modname] = modobj
                 except ConfigError as e:
                     errors.append('error creating module %s:' % modname)
-                    for errtxt in e.args[0]:
+                    for errtxt in e.args[0] if isinstance(e.args, list) else [e.args[0]]:
                         errors.append('  ' + errtxt)
                 except Exception:
                     failure_traceback = traceback.format_exc()