Does the hotfix also take care of this?
Fatal error
: Uncaught TypeError: Argument 1 passed to Text::output() must be of the type string, null given, called in
includes/functions/general.php on line 55 and defined in
includes/system/versioned/1.0.7.other/1.0.7.12/text.php:36 Stack trace: #0
includes/functions/general.php(55): Text::output(NULL, false) #1
includes/apps/kiss_image_thumbnailer/classes/Image_Helper.php(120): tep_output_string(NULL) #2
includes/apps/kiss_image_thumbnailer/classes/Image_Helper.php(56): Image_Helper->_build() #3
includes/functions/kiss_it_image.php(64): Image_Helper->assemble() #4
in includes/system/versioned/1.0.7.other/1.0.7.12/text.php on line 36
Phoenix 1.0.7.13 Kissit 3.5.0 PHP 7.2.33
(Also, the support link in the download documentation is outdated.)