diff --git a/run.py b/run.py
index 2c0ccec..565b6c8 100644
--- a/run.py
+++ b/run.py
@@ -59,6 +59,10 @@ def argHandler_terminalId(name):
 def argHandler_credentials(_credentials):
     global credentials
 
+    if ":" not in _credentials:
+        print("[Error] Credentials format must be such as USER:PASS.\n")
+        exit(0)
+
     credentials = _credentials
 
     arg_config["CREDENTIALS"] = credentials