When you delete all categories in a blog (eg. an aggregator blog), the option 'New post »' is still in the Contents->Newblog->Posts tab. If you for mistake select this option, you get following error, instead of message T_('Since this blog has no categories, you cannot post into it. You must <a %s>create categories</a> first.'). I tried this in my local installation and in b2evo5 demo, and get the same result. Can you take a look at it, please?

Additional information about this error:

Requested Chapter from T_categories without ID!
Backtrace:

debug_die( "Requested Chapter from T_categories without ID!" )
File: F:\www\b2evolution504\inc\chapters\model\_chaptercache.class.php on line 94
ChapterCache->get_by_ID( NULL, false )
File: F:\www\b2evolution504\inc\items\model\_itemlight.class.php on line 639
ItemLight->get_main_Chapter( )
File: F:\www\b2evolution504\inc\items\model\_itemlight.class.php on line 725
ItemLight->get_blog_ID( )
File: F:\www\b2evolution504\inc\items\model\_itemlight.class.php on line 1335
ItemLight->load_Blog( )
File: F:\www\b2evolution504\inc\items\model\_item.class.php on line 538
Item->load_from_Request( true )
File: F:\www\b2evolution504\inc\items\items.ctrl.php on line 347
require( "F:\www\b2evolution504\inc\items\items.ctrl.php" )
File: F:\www\b2evolution504\admin.php on line 245
Ignored last: 1