Error: Call to a member function getTargetEntityTypeId() on null

The issue is in EntityReferenceDisplayFormatterTrait class. In the parent issue methods __construct and create. Maybe it it would work in trait, but __construct completely overwrites parent constructors, so property fieldDefinition that is defined in FormatterBase is not set, because it is set in its __construct method.

Working on it.

To avoid overriding construct and create methods, I suggest using parent::create call. This way any changes in parent classes will be covered still.

Uploading patch for using in composer based projects. Please ignore it and review the MR instead.

@a.dmitriiev click 'plain diff' in MR line to see the patch.

Confirmed the patch solves the issue, thank you!

Thank @cb for a hint, but composer patches version 2.x doesn't allow to have patches from MR links.

@a.dmitriiev You can add patches from MRs like so:

https://git.drupalcode.org/project/entity_reference_display/-/merge_requests/14.patch

Thanks for the fix!

Given that this produces a fatal error on page loads using this module, it would be much appreciated for a new release to be provided that includes this committed change. Certainly patches can be applied, but that requires time and effort on the part of every developer supporting sites using this module's latest release. In contrast, providing a new release requires only the time and effort of a single individual.

This kind of fix-and-release philosophy is potentially more important these days. Many developers/teams use continuous integration to automatically apply contributed code updates. Ideally, that continuous integration will have tests that check before deployment. But those tests don't always catch the issue. This was the case with our team's CI process.

Thanks for the consideration!

Automatically closed - issue fixed for 2 weeks with no activity.