Thanks for module.

On my devel server - all OK. It has a lot of memory

But on production server (some memory) there is problem when editing book block.

URL: http://www._xxx_.com/admin/settings/advanced-book-blocks/configure/1
Fatal error: Out of memory (allocated 103022592) (tried to allocate 4601269 bytes) in /www/formagot/www/htdocs/includes/common.inc on line 2933