Inspect your category data, it seems you have some invalid data in there.
Crashes in Current main Branch
I get now often following error after
@400000005707b689004ed98c 8/4 15:47  - error: TypeError: Cannot read property 'name' of null @400000005707b689004f086c at /home/ok/ggg/src/controllers/admin/categories.js:27:56 @400000005707b689004f086c at fireFilterHook (/home/ok/ggg/src/plugins/hooks.js:92:11) @400000005707b689004f0c54 at Object.Plugins.fireHook (/home/ok/ggg/src/plugins/hooks.js:76:5) @400000005707b689004f103c at /home/ok/ggg/src/controllers/admin/categories.js:23:11 @400000005707b689004f103c at /home/ok/ggg/node_modules/async/lib/async.js:726:13 @400000005707b6890050d55c at /home/ok/ggg/node_modules/async/lib/async.js:52:16 @400000005707b6890050d944 at done (/home/ok/ggg/node_modules/async/lib/async.js:246:17) @400000005707b6890050d944 at /home/ok/ggg/node_modules/async/lib/async.js:44:16 @400000005707b6890050dd2c at /home/ok/ggg/node_modules/async/lib/async.js:723:17 @400000005707b6890050e114 at /home/ok/ggg/node_modules/async/lib/async.js:167:37 @400000005707b689006612dc TypeError: Cannot read property 'name' of null @400000005707b689006616c4 at /home/ok/ggg/src/controllers/admin/categories.js:27:56 @400000005707b68900661aac at fireFilterHook (/home/ok/ggg/src/plugins/hooks.js:92:11) @400000005707b68900661aac at Object.Plugins.fireHook (/home/ok/ggg/src/plugins/hooks.js:76:5) @400000005707b68900661e94 at /home/ok/ggg/src/controllers/admin/categories.js:23:11 @400000005707b6890066227c at /home/ok/ggg/node_modules/async/lib/async.js:726:13 @400000005707b6890066af1c at /home/ok/ggg/node_modules/async/lib/async.js:52:16 @400000005707b6890066b304 at done (/home/ok/ggg/node_modules/async/lib/async.js:246:17) @400000005707b6890066b6ec at /home/ok/ggg/node_modules/async/lib/async.js:44:16 @400000005707b6890066b6ec at /home/ok/ggg/node_modules/async/lib/async.js:723:17 @400000005707b6890066bad4 at /home/ok/ggg/node_modules/async/lib/async.js:167:37
highly advise staying off the beta releases, the idea is great for testers maybe not so great for ppl wanting stable components
Sorry if I bother some one to much, I am aware of the problems of the main branch and I know, that I am using the main branch and it can destroy my forum, my computer, create singularity and wipe the universe. I thought I can help , if I see such errors and do not have time to look on it deeply just now, than I write it here. If this is wrong place or no body find it useful, I will not write it here anymore.
Please specify your git revision and the page you are on when this happens.
The should get rid of the crash
Although it seems you might have an invalid category in your database.
Thank you for the reply! It has fixed the problem, and it was indeed invalid category, I need also check the database, able somewhere is a invalid reference ...