did you clear the cache before? put the theme back to default?
delete old in var/cache/prod
Quote2024-11-20 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
this is notice , you are not a warn log ?
the best for upgrade :
installe prestashop to 8.2
Add MigrationPro: Bridge connector to prestashop 1.7
Add MigrationProto your prestashop 8.2
Go to Ps 8.2 and synchronyse this for recover your info from 1.7 to 8.2
your theme and template will not be recovered