ContextErrorException: Notice: Undefined offset: 1

[flrn]

Hello,

I'm getting the error "ContextErrorException - Notice: Undefined offset: 1" from a PrestaShop 1.7.7.2. The shop was at version 1.7.2.0 on another server with Apache, I migrated it, switched it to nginx and upgraded it to a newer version. Everything seems working, aside from this error which was not present before the version upgrade.

The shop is using a JMS theme, from which I believe the error originates somehow but I'm not sure as I'm not a PrestaShop specialist and as far as I can see there is some overlap between the additional and the built-in theming.

Find attached the debug output from the shop. The shop is available at https://whataeco-backstage.de, which is a migration domain.

Any help is greatly appreciated.

dump.html