WBB3 Woltlab Burning Board 3 with short salts: Line-length exception

Hi guys,
first of all, thanks to atom for helping me last time and bringing this great project ahead!

So I got these hashes , which are sha1($salt.sha1($salt.sha1($pass))).
Now, if I don't get wrong, this hash should be equivalent to WBB3 Woltlab Burning Board 3.

However, mine have a much shorter salt than typical WBB3, here's an example in hash: salt: pass format:

This fact leads of course to a Line-Length Exception error in hashcat. 
Yet, the hash is for sure sha1($salt.sha1($salt.sha1($pass))) and can be decrypted in PasswordsPro, though it's dramatically slow.

Can anyone suggest me a workaround for this?

Thank you so much for your help!