[BUG] PM attachments sometimes failing to send

[namida]

This has been reported in other topics (or maybe Discord, or maybe both) in the past.

Making a topic about it, also so that I can save a record from the error log here:

<username redacted>
<IP address redacted>
<session ID redacted>
https://www.lemmingsforums.net/index.php?action=pm;sa=send2
/home/lemmingsforums.net/www/public/Sources/Errors.php (Line 234)

Backtrace information

Type of error: Undefined
Error message
2: Undefined array key "attachments_limit_per_post"