500 Error after login

[JoJo]

After loggin
/apartments/backend/main/admin
throws
Error 500
Undefined offset: 5

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V1.12.0
XAMPP 5.6.3 on Win 7
test server not publicly accessible

[JoJo]

Found the problem.

backend/main/admin -> Settings -> Listings

if Possibility to add listings of the type "Rent property to smb" -> "per month" is set to '0'
you will get the 500 error.

[fisher]

Try to reload the files and reinstall the product.