Thanks for reporting, Dominik.
Logs like that were caused by images inserted manually via Tools -> Source Code without width/height specification.
Release 7.1 will issue an error message instead now in case dimensions are missing because they are mandatory for a proper responsive way of displaying

I get this error in error log:

[06-Jun-2023 17:22:36 UTC] PHP WARNING: 2023-06-06 17:22:36 (UTC): "Undefined array key 1" in file /home/queermeet/publichtml/components/TextareaSupport/ossncom.php (line 87)

[06-Jun-2023 17:22:36 UTC] PHP WARNING: 2023-06-06 17:22:36 (UTC): "Undefined array key 1" in file /home/queermeet/publichtml/components/TextareaSupport/ossncom.php (line 88)

Hey, Michael! How can I get version 6.7 of this component? I would love to use your project!

Please note:

Textarea Support 6.7 and former releases are NOT COMPATIBLE with Ossn >= 6.2

Thus, right before you start upgrading to Ossn 6.2 do the following steps:

1. Disable all components which depend on Textarea Support (= Bio, Blog, Notes, KatexRendering)
2. Delete Textarea Support 6.7

Then, after having successfully upgraded to Ossn 6.2

1. Install and enable Textarea Support 6.8
2. Re-enable the components which depend on Textarea Support (= Bio, Blog, Notes, KatexRendering)