Mime type empty for thumbnail sizes

We are having an issue when the plugin is active and we upload files. Then if we want to delete the image we get a fatal error. The error itself comes from the imagify, but the issue stems from mine-type being empty which comes from this plugin. When the imagemagick plugin is deactivated and we upload a file there is no issue when deleting it. I have tried activating the setting ‘Preserve Exif data’ but that doesn’t seem to make a difference.

[15-Jul-2026 11:26:49 UTC] Array
(
[size] => full
[path] => wp-content/uploads/2026/07/mtollenaere_chaingang_working_-sref_httpss.mj_.runYJRbSQ5DP6w_c63a5e80-6c37-4d72-8b3f-b5ec36b76538_3-1-1.png
[width] => 1024
[height] => 1024
[mime-type] => image/png
[disabled] =>
)

[15-Jul-2026 11:26:49 UTC] Array
(
[size] => thumbnail
[path] => /wp-content/uploads/2026/07/mtollenaere_chaingang_working_-sref_httpss.mj_.runYJRbSQ5DP6w_c63a5e80-6c37-4d72-8b3f-b5ec36b76538_3-1-1-150x150.png
[width] => 150
[height] => 150
[mime-type] =>
[disabled] =>
)

[15-Jul-2026 11:26:49 UTC] PHP Fatal error: Uncaught TypeError: strpos(): Argument #1 ($haystack) must be of type string, null given in /usr/www/users/mmadmin/temp-update-3/wp-content/plugins/imagify/classes/Optimization/Process/AbstractProcess.php:1420
Stack trace: 0 /usr/www/users/mmadmin/temp-update-3/wp-content/plugins/imagify/classes/Optimization/Process/AbstractProcess.php(1420): strpos() 1 /usr/www/users/mmadmin/temp-update-3/wp-content/plugins/imagify/inc/common/attachments.php(41): Imagify\Optimization\Process\AbstractProcess->delete_nextgen_files() 2 /usr/www/users/mmadmin/temp-update-3/wp-includes/class-wp-hook.php(341): imagify_cleanup_after_media_deletion() 3 /usr/www/users/mmadmin/temp-update-3/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters() 4 /usr/www/users/mmadmin/temp-update-3/wp-includes/plugin.php(522): WP_Hook->do_action() 5 /usr/www/users/mmadmin/temp-update-3/wp-content/plugins/imagify/inc/functions/media.php(21): do_action() 6 /usr/www/users/mmadmin/temp-update-3/wp-content/plugins/imagify/inc/common/attachments.php(20): imagify_trigger_delete_media_hook() 7 /usr/www/users/mmadmin/temp-update-3/wp-includes/class-wp-hook.php(343): imagify_trigger_delete_attachment_hook() 8 /usr/www/users/mmadmin/temp-update-3/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters() 9 /usr/www/users/mmadmin/temp-update-3/wp-includes/plugin.php(522): WP_Hook->do_action() 10 /usr/www/users/mmadmin/temp-update-3/wp-includes/post.php(6740): do_action() 11 /usr/www/users/mmadmin/temp-update-3/wp-admin/post.php(321): wp_delete_attachment() 12 {main}

thrown in /usr/www/users/mmadmin/temp-update-3/wp-content/plugins/imagify/classes/Optimization/Process/AbstractProcess.php on line 1420