Access to protected product in developer mode throws HTTP 500: Page ID XXX is not routable when maintenance is enabled (ResourceNotFoundException)

[AlexanderWillner]

Version: Contao 4.13.21 with Isotope 2.8

Steps that will reproduce the problem?

0. Setup: enable developer mode (.env: APP_ENV=dev)
1. Backend: create a protected product
2. Frontend: login and browse to protected product
3. Backend: enable maintenance mode of root page
4. Frontend: reload

What is the expected result?

Maintenance warning.

What happens instead?

ResourceNotFoundException in https://github.com/isotope/core/blob/4e09cc5eb78bd64edb5a967b43eddd367248cb39/system/modules/isotope/library/Isotope/Frontend.php#LL569C1-L570C1 due to the Breadcrumb module.

Details

HTTP 500: ResourceNotFoundException - Page ID 431 is not routable

in [vendor/contao/core-bundle/src/Resources/contao/models/PageModel.php ](https://localhost:8099/_profiler/open?file=vendor/contao/core-bundle/src/Resources/contao/models/PageModel.php&line=1374#line1374)(line 1374)
in [vendor/isotope/isotope-core/system/modules/isotope/library/Isotope/Frontend.php ](https://localhost:8099/_profiler/open?file=vendor/isotope/isotope-core/system/modules/isotope/library/Isotope/Frontend.php&line=569#line569)-> getFrontendUrl (line 569)
in [vendor/contao/core-bundle/src/Resources/contao/modules/ModuleBreadcrumb.php ](https://localhost:8099/_profiler/open?file=vendor/contao/core-bundle/src/Resources/contao/modules/ModuleBreadcrumb.php&line=224#line224)-> addProductToBreadcrumb (line 224)
in [vendor/contao/core-bundle/src/Resources/contao/modules/Module.php ](https://localhost:8099/_profiler/open?file=vendor/contao/core-bundle/src/Resources/contao/modules/Module.php&line=214#line214)-> compile (line 214)
in [vendor/contao/core-bundle/src/Resources/contao/modules/ModuleBreadcrumb.php ](https://localhost:8099/_profiler/open?file=vendor/contao/core-bundle/src/Resources/contao/modules/ModuleBreadcrumb.php&line=47#line47)-> generate (line 47)
in [vendor/contao/core-bundle/src/Resources/contao/library/Contao/Controller.php ](https://localhost:8099/_profiler/open?file=vendor/contao/core-bundle/src/Resources/contao/library/Contao/Controller.php&line=440#line440)-> generate (line 440)

[aschempp]

Fixed in 0100347