Error on installing 3.0.0 from app store

[mogwa1]

See below for the error log. It seems to fail on TimestampMigration.php#45.
I don't know whether this might be the cause, but I'm running nextcloud 22 on PHP8.

I can GET and POST subscriptions just fine, but EpisodeAction POSTs don't seem to do anything. There's a timestamp response to the POST, but it looks like nothing is added to the database.

NB: Again, I don't know if it's related, but GET /index.php/apps/gpoddersync/episode_action fails without a since query. If I add any value for since then it works just fine.
Nevermind these remarks, I got it running.

{"reqId":"oer6QFcVkZBPWCmzZtHI","level":3,"time":"2021-10-12T18:47:27+00:00","remoteAddr":"xx.xx.xx.xx","user":"xxx","app":"PHP","method":"POST","url":"/index.php/settings/apps/enable","message":"Undefined variable $result at /var/lib/nextcloud/apps/gpoddersync/lib/Migration/TimestampMigration.php#45","userAgent":"xxx","version":"22.2.0.2","exception":{"Exception":"Error","Message":"Undefined variable $result at /var/lib/nextcloud/apps/gpoddersync/lib/Migration/TimestampMigration.php#45","Code":0,"Trace":[{"file":"/var/lib/nextcloud/apps/gpoddersync/lib/Migration/TimestampMigration.php","line":45,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::"},{"file":"/usr/share/webapps/nextcloud/lib/private/Repair.php","line":123,"function":"run","class":"OCA\\GPodderSync\\Migration\\TimestampMigration","type":"->"},{"file":"/usr/share/webapps/nextcloud/lib/private/legacy/OC_App.php","line":1059,"function":"run","class":"OC\\Repair","type":"->"},{"file":"/usr/share/webapps/nextcloud/lib/private/Installer.php","line":157,"function":"executeRepairSteps","class":"OC_App","type":"::"},{"file":"/usr/share/webapps/nextcloud/apps/settings/lib/Controller/AppSettingsController.php","line":447,"function":"installApp","class":"OC\\Installer","type":"->"},{"file":"/usr/share/webapps/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":217,"function":"enableApps","class":"OCA\\Settings\\Controller\\AppSettingsController","type":"->"},{"file":"/usr/share/webapps/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":126,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/usr/share/webapps/nextcloud/lib/private/AppFramework/App.php","line":156,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/usr/share/webapps/nextcloud/lib/private/Route/Router.php","line":301,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/usr/share/webapps/nextcloud/lib/base.php","line":1000,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/usr/share/webapps/nextcloud/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/usr/share/webapps/nextcloud/lib/private/Log/ErrorHandler.php","Line":92,"CustomMessage":"--"},"id":"6165d85432919"}

[mogwa1]

I've just tried rolling back to PHP7.4, but to no avail. The errors remain the same.
I might add that I've installed the app a while ago on one of the 1.x releases and have upgraded it multiple times.

[mogwa1]

Looking at the code (I'm not a PHP expert), it looks like it's will throw the error when there are no items in the database to convert from datetime to unix timestamp. In that case $result will indeed not be defined.

If that's the case then the error itself is rather harmless since there was nothing to migrate.

[JonOfUs]

In that case $result will indeed not be defined.

Yes, this indeed is the problem. Fixed it in #40.

If that's the case then the error itself is rather harmless since there was nothing to migrate.

Yes, maintenance:repair didn't even mention this error on my setup - it just appeared in the log. Important to fix anyway.

[thrillfall]

Fixed. Thanks @JonOfUs