[turba] Creating List in write-protected address book

[lst_hoe01 at kwsoft.de]

Hello

if a user try to create a list in a write-protected address book we get a blank
screen and the error "Call to undefined function: isgroup() in
<path>/turba/browse.php".

Version is Turba 2.0.2

Any hints how to get a error message?

Thanxs

Andreas