https://lt.free.nf/index.php?room=1
系统暂时不可用，请稍后重试
Hello! I’m currently testing an online chat system built with PHP + Ajax polling on the website lt.free.nf, but encountered an error during operation: “System temporarily unavailable. Please try again later.” Could you please help me resolve this issue? Thank you very much!
FYI, the system works fine during local testing.
I’m seeing the following error:
“Warning : Undefined array key “user_id” in /home/vol14_2/infinityfree.com/if0_36883115/lt.free.nf/htdocs/includes/room_data.php on line 19”
Ok so on (or around) line 19, in your php file “room_data.php”
unfortunately, we obviously can’t see the script to help fix it, since php is compiled on the server side.
I’m guessing here that in your php file you’re making an SQL call to get the room data, but “user_id” isn’t part of that data.
But without the script I can’t be certain.
Thank you for your kind remind!
I’ve found the php error and fixed it!
That’s great 
Glad you’ve been able to fix it 
Please be aware that live chat systems are not allowed on infinityfree
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