I'm trying to upgrade from PS 1.7.4.3 to 8.2.0 but every time I get to the final stage of installation it throws a 500 internal server error message:
The error log entries are as follows:
2024-11-20 18:02:27.277122 [NOTICE] [11898] [T0] [96.63.158.143:52935:HTTP2-119#APVH_thunderbirdmodels.com:443] [STDERR] PHP Notice: Trying to get property 'theme_name' of non-object in /home/thunder3/public_html/test_site/var/cache/prod/ContainerUGuOxCa/appAppKernelProdContainer.php on line 3376\n
2024-11-20 18:01:40.649150 [NOTICE] [11898] [T0] [96.63.158.143:52935:HTTP2-99#APVH_thunderbirdmodels.com:443] [STDERR] PHP Notice: Trying to get property 'theme_name' of non-object in /home/thunder3/public_html/test_site/var/cache/prod/ContainerHDHVzYL/appAppKernelProdContainer.php on line 2911\n
2024-11-20 17:58:40.253155 [NOTICE] [11898] [T0] [96.63.158.143:52935:HTTP2-41#APVH_thunderbirdmodels.com:443] [STDERR] PHP Notice: Trying to get property 'theme_name' of non-object in /home/thunder3/public_html/test_site/var/cache/prod/ContainerBFkNWEE/appAppKernelProdContainer.php on line 3376\n
2024-11-20 17:57:46.169190 [NOTICE] [11898] [T0] [96.63.158.143:52935:HTTP2-23#APVH_thunderbirdmodels.com:443] [STDERR] PHP Notice: Trying to get property 'theme_name' of non-object in /home/thunder3/public_html/test_site/var/cache/prod/ContainerGqxJggE/appAppKernelProdContainer.php on line 2911\n
2024-11-20 17:53:06.187748 [NOTICE] [11898] [T0] [96.63.158.143:52892:HTTP2-43#APVH_thunderbirdmodels.com:443] [STDERR] PHP Notice: Trying to get property 'theme_name' of non-object in /home/thunder3/public_html/test_site/var/cache/prod/ContainerFzGJDS7/appAppKernelProdContainer.php on line 3548\n
Can anyone shed any light on this please?