hi, i dont know why you see white screen after this command. You have forget ">" in meta tag, but i'm not sure that its main problem.
I can't tell you whats wrong, maybe you have insufficient buffer size or something like this. Can you provide full code?
Anyway, if you want to create TOP plugin, then you must know that this task is in our roadmap: https://kz-rush.ru/en/page/roadmap . if it doesn't bother you, then we can talk about special API which are similar to API's on our Game Servers, but currently its not fully developed and needs more time and testing, so must be discussed in private mode.