It's happening again 
so I checked browser console.
so I checked browser console.
Code:
POST https://www.thecoli.com/index.php?editor/to-bb-code 500 (Internal Server Error)
send @ jquery.min.js:2
ajax @ jquery.min.js:2
ajax @ core-compiled.js?_v=12429a25:40
g @ editor-compiled.js?_v=12429a25:1062
toggle @ editor-compiled.js?_v=12429a25:1064
callback @ editor-compiled.js?_v=12429a25:1045
h @ editor-compiled.js?_v=12429a25:79
n @ editor-compiled.js?_v=12429a25:400
l @ editor-compiled.js?_v=12429a25:401
x @ editor-compiled.js?_v=12429a25:401
Y @ editor-compiled.js?_v=12429a25:66
(anonymous) @ editor-compiled.js?_v=12429a25:70
(anonymous) @ editor-compiled.js?_v=12429a25:534
core-compiled.js?_v=12429a25:42 PHP: <html>
<head><title>500 Internal Server Error</title></head>
<body>
<center><h1>500 Internal Server Error</h1></center>
<hr><center>nginx/1.20.1</center>
</body>
</html>
<!-- a padding to disable MSIE and Chrome friendly error page -->
<!-- a padding to disable MSIE and Chrome friendly error page -->
<!-- a padding to disable MSIE and Chrome friendly error page -->
<!-- a padding to disable MSIE and Chrome friendly error page -->
<!-- a padding to disable MSIE and Chrome friendly error page -->
<!-- a padding to disable MSIE and Chrome friendly error page -->
defaultAjaxError @ core-compiled.js?_v=12429a25:42
l @ core-compiled.js?_v=12429a25:39
c @ jquery.min.js:2
fireWith @ jquery.min.js:2
l @ jquery.min.js:2
(anonymous) @ jquery.min.js:2
load (async)
send @ jquery.min.js:2
ajax @ jquery.min.js:2
ajax @ core-compiled.js?_v=12429a25:40
g @ editor-compiled.js?_v=12429a25:1062
toggle @ editor-compiled.js?_v=12429a25:1064
callback @ editor-compiled.js?_v=12429a25:1045
h @ editor-compiled.js?_v=12429a25:79
n @ editor-compiled.js?_v=12429a25:400
l @ editor-compiled.js?_v=12429a25:401
x @ editor-compiled.js?_v=12429a25:401
Y @ editor-compiled.js?_v=12429a25:66
(anonymous) @ editor-compiled.js?_v=12429a25:70
(anonymous) @ editor-compiled.js?_v=12429a25:534
