diff --git a/offline-minecraft-launcher.py b/offline-minecraft-launcher.py
index c5dee35..288c944 100644
--- a/offline-minecraft-launcher.py
+++ b/offline-minecraft-launcher.py
@@ -256,6 +256,8 @@ def main():
 			else:
 				lv[argSplit[0]] = True
 	
+	json.loads(lv["jvmArguments"])
+	
 	if not lv["osName"] in ["windows","linux","macos"]:
 		print("Warning, unsupported OS detected: " +lv["osName"])
 		print("Needs to be either windows, linux or macos. Define it with osName=name in the config.")