The module assumes that any entity it accesses via hook will be moderated.
Not all entities on a site are always moderated;
This line:
$transition = $validator->getValidTransitions($entity, $currentUser);
throws a php error even for entity reference fields when rendered anywhere.
Enable the module and try to view a node of non-moderated type
Check for moderation/workflow on the accessed entity
Downport
2.0
Code
Applied to both (in progress, somewhat disruptive) 2.0.x and 8.x-1.x (we should tag a point release there soon) branches.
Automatically closed - issue fixed for 2 weeks with no activity.