OCP\Files\NotFoundException: Max preview size 0, invalid!

[max-nextcloud]

Describe the bug
Found this in the logs of our instance:

OCP\Files\NotFoundException: Max preview size 0, invalid!
  File "/var/www/nextcloud/lib/private/Preview/Generator.php", line 124, in OC\Preview\Generator::generatePreviews
    throw new NotFoundException('Max preview size 0, invalid!');
  File "/var/www/nextcloud/lib/private/Preview/Generator.php", line 87, in OC\Preview\Generator::getPreview
    return $this->generatePreviews($file, [$specification], $mimeType);
  File "/var/www/nextcloud/lib/private/PreviewManager.php", line 167, in OC\PreviewManager::getPreview
    $preview = $this->getGenerator()->getPreview($file, $width, $height, $crop, $mode, $mimeType);
  File "/text/lib/Service/AttachmentService.php", line 90, in OCA\Text\Service\AttachmentService::getImageFileContent
    return $this->previewManager->getPreview($imageFile, 1024, 1024);
  File "/text/lib/Service/AttachmentService.php", line 55, in OCA\Text\Service\AttachmentService::getImageFile
    return $this->getImageFileContent($imageFileName, $textFile, $preferRawImage);

Expected behavior
No errors in the logs

Server details:

our server, latest 31

[juliusknorr]

I think this is something where it would be interesting to learn what the image file contained that lead to an empty preview. Nothing for text I'd say rather to address in server. Do you still have info which file was causing that?

Maybe we have an empty image file that leads ot an empty preview where we could return early instead of logging an error?

[max-nextcloud]

@juliusknorr https://cloud.nextcloud.com/f/11118812 the first included image. Now it has a preview. Not sure what happened. Maybe the file was broken and reuploaded.

[juliusknorr]

Let's close then. We can address if we have some way to reproduce this again.