diff --git a/offline-minecraft-launcher.py b/offline-minecraft-launcher.py
index 8805790..46caa0c 100644
--- a/offline-minecraft-launcher.py
+++ b/offline-minecraft-launcher.py
@@ -283,6 +283,7 @@ def main():
 	
 	if len(sys.argv) > 1:
 		for arg in sys.argv[1:]:
+			if arg.startswith("-"): continue
 			argSplit = arg.split("=",1)
 			if len(argSplit) > 1:
 				lv[argSplit[0]] = argSplit[1]