I'm seeing the following exceptions in the Gallery on PHP8:

the first on gallery/front/view/imageFrame

TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /suite/system/Theme/Theme.php(885) : eval()'d code:536
Stack trace:
#0 /suite/system/Theme/SandboxedTemplate.php(61): IPS\Theme\class_gallery_front_view->imageFrame(Object(IPS\gallery\Image))
#1 /suite/system/Theme/Theme.php(885) : eval()'d code(339): IPS\Theme\_SandboxedTemplate->__call('imageFrame', Array)
#2 /suite/system/Theme/SandboxedTemplate.php(61): IPS\Theme\class_gallery_front_view->image(Object(IPS\gallery\Image), '\n<div data-cont...')
#3 /suite/applications/gallery/modules/front/gallery/view.php(339): IPS\Theme\_SandboxedTemplate->__call('image', Array)
#4 /suite/system/Dispatcher/Controller.php(118): IPS\gallery\modules\front\gallery\_view->manage()
#5 /suite/system/Content/Controller.php(50): IPS\Dispatcher\_Controller->execute()
#6 /suite/applications/gallery/modules/front/gallery/view.php(65): IPS\Content\_Controller->execute()
#7 /suite/system/Dispatcher/Dispatcher.php(153): IPS\gallery\modules\front\gallery\_view->execute()
#8 /suite/index.php(13): IPS\_Dispatcher->run()
#9 {main}

second on gallery/front/view/imageLightboxFrame

TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /suite/system/Theme/Theme.php(885) : eval()'d code:2818
Stack trace:
#0 /suite/system/Theme/SandboxedTemplate.php(61): IPS\Theme\class_gallery_front_view->imageLightboxFrame(Object(IPS\gallery\Image))
#1 /suite/system/Theme/Theme.php(885) : eval()'d code(2673): IPS\Theme\_SandboxedTemplate->__call('imageLightboxFr...', Array)
#2 /suite/system/Theme/SandboxedTemplate.php(61): IPS\Theme\class_gallery_front_view->imageLightbox(Object(IPS\gallery\Image), '\n<div data-cont...')
#3 /suite/applications/gallery/modules/front/gallery/view.php(334): IPS\Theme\_SandboxedTemplate->__call('imageLightbox', Array)
#4 /suite/system/Dispatcher/Controller.php(118): IPS\gallery\modules\front\gallery\_view->manage()
#5 /suite/system/Content/Controller.php(50): IPS\Dispatcher\_Controller->execute()
#6 /suite/applications/gallery/modules/front/gallery/view.php(65): IPS\Content\_Controller->execute()
#7 /suite/system/Dispatcher/Dispatcher.php(153): IPS\gallery\modules\front\gallery\_view->execute()
#8 /suite/index.php(13): IPS\_Dispatcher->run()
#9 {main}

Both fixed locally by changing a count to also include an non-null check on the $image->_notes count.

is there something inconsistent with my installation, or is this a PHP8 compat issue?

Edited October 12, 20222 yr by G17 Media

Edit: This seems to only happen on very old gallery images. So perhaps it is old data causing that to be NULL?

Please upgrade to the latest release and test this in the first instance. If you are then still having the same issues, please let us know, and we can take a look for you.