diff --git a/update-firewall-source.py b/update-firewall-source.py
index cebaa8a..97e24af 100644
--- a/update-firewall-source.py
+++ b/update-firewall-source.py
@@ -111,7 +111,7 @@ ini_defaults = []
 internal_defaults = {default["key"]: default["value"] for default in CONST.CFG_KNOWN_DEFAULTS}
 internal_globals = [default["key"] for default in CONST.CFG_KNOWN_DEFAULTS if default["is_global"]]
 config = ConfigParser(defaults=internal_defaults,
-                      converters={'list': lambda x: [i.strip() for i in x.split(',')]})
+                      converters={'list': lambda x: [i.strip() for i in x.split(',') if len(x) > 0]})
 config.read(CONST.CFG_DEFAULT_ABS_PATH)