I try to give you more information.
We use the chat with from a classic asp forum.
User from this forum have to sign in there.
Then, they have a link to the chat.
With this link, i also sumbmit some data via querysting.
The target is a aspx site, where i compare the data in de querystring with the data in the database.
Are the data ok, then the user will be authorized und i make a rederict to the chat.
I can't tell you, how often the chat bring this error.
I think the erorr serves in the page CH_MainForm.js.aspx
... var OxO3e50 ... [[MsgNotSent]]...
on what terms will the MsgNotSent be desplayed ??
Someone or someting try to send the value null.
So, i hope, you understood me.
Thank you for your help