In Joomla 4.0 open an existing banner. Modify anything (e.g. title) and save.
Save banner.
You get message:
0 Call to a member function load() on boolean
Joomla 4.0
The problem is identified in file: administrator\components\com_banners\Table\BannerTable.php
I attach a patch that fixes the issue:
BannerTable.txt
| Labels | Added: 
? | ||
| Category | ⇒ | com_banners | 
| Status | New | ⇒ | Confirmed | 
 
                 
                The issue is present.
 
                Please update the title to have [4.0] at the beginning
| Title | 
 | ||||||
| Status | Confirmed | ⇒ | Closed | 
| Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2017-12-21 12:29:00 | 
| Closed_By | ⇒ | joomla-cms-bot | 
| Closed_By | joomla-cms-bot | ⇒ | franz-wohlkoenig | 
 
                Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/19016
Issue confirmed,
This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/19016.