That sounds good!, I think you should check your plugin and make sure the ids are deleted from that object, it seems like this code should do it not sure why it wasn't cleared when you deleted all users.
Error logs
Solved
Technical Support
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11/5 22:06 [2132] - [31merror[39m: /category/95.rss Error: Błędne ID Kategorii at async.waterfall.category.topics (/root/nodebb/src/categories.js:35:18) at fn (/root/nodebb/node_modules/async/lib/async.js:746:34) at /root/nodebb/node_modules/async/lib/async.js:1213:16 at /root/nodebb/node_modules/async/lib/async.js:166:37 at /root/nodebb/node_modules/async/lib/async.js:706:43 at /root/nodebb/node_modules/async/lib/async.js:167:37 at /root/nodebb/node_modules/async/lib/async.js:1209:30 at /root/nodebb/src/categories.js:168:4 at /root/nodebb/node_modules/async/lib/async.js:726:13 at /root/nodebb/node_modules/async/lib/async.js:52:16 at done (/root/nodebb/node_modules/async/lib/async.js:246:17) at /root/nodebb/node_modules/async/lib/async.js:44:16 at /root/nodebb/node_modules/async/lib/async.js:723:17 at /root/nodebb/node_modules/async/lib/async.js:167:37 at /root/nodebb/src/categories.js:234:4 at /root/nodebb/node_modules/async/lib/async.js:52:16