diff --git a/src/opnsense/scripts/OPNsense/CaptivePortal/allow.py b/src/opnsense/scripts/OPNsense/CaptivePortal/allow.py
index 51349d409..c53850aea 100755
--- a/src/opnsense/scripts/OPNsense/CaptivePortal/allow.py
+++ b/src/opnsense/scripts/OPNsense/CaptivePortal/allow.py
@@ -38,7 +38,7 @@ from lib.ipfw import IPFW
 parameters = {'username': '', 'ip_address': None, 'zoneid': None, 'output_type':'plain'}
 current_param = None
 for param in sys.argv[1:]:
-    if param[0] == '/':
+    if len(param) > 1 and param[0] == '/':
         current_param = param[1:].lower()
     elif current_param is not None:
         if current_param in parameters:
diff --git a/src/opnsense/scripts/OPNsense/CaptivePortal/listClients.py b/src/opnsense/scripts/OPNsense/CaptivePortal/listClients.py
index 741f23bfa..2ee95f6b8 100755
--- a/src/opnsense/scripts/OPNsense/CaptivePortal/listClients.py
+++ b/src/opnsense/scripts/OPNsense/CaptivePortal/listClients.py
@@ -36,7 +36,7 @@ from lib.db import DB
 parameters = {'zoneid': None, 'output_type':'plain'}
 current_param = None
 for param in sys.argv[1:]:
-    if param[0] == '/':
+    if len(param) > 1 and param[0] == '/':
         current_param = param[1:].lower()
     elif current_param is not None:
         if current_param in parameters: