diff --git a/config-tool/config_command.py b/config-tool/config_command.py
index cea848da..88ba0b6e 100755
--- a/config-tool/config_command.py
+++ b/config-tool/config_command.py
@@ -14,6 +14,10 @@
 
 device = get_device()
 
+if not sys.argv or sys.argv[1].lower() not in commands:
+    print("Provide one command: ", ', '.join(commands))
+    sys.exit(1)
+
 config_command = commands[sys.argv[1].lower()]
 
 data = struct.pack(