After upgrading hibernate-orm 5.2.13 to 5.2.14 I am getting a NPE during WildFly 11 server startup. Sorry about posting it here, unfortunately hibernate has no issue tracking in GitHub. Also I cannot yet provide you with more detailed information about which entity mappings are involved.

Stack trace:
Caused by: java.lang.NullPointerException
at org.hibernate//org.hibernate.persister.entity.AbstractPropertyMapping.getSuperCollection(AbstractPropertyMapping.java:285)
at org.hibernate//org.hibernate.persister.entity.AbstractPropertyMapping.addPropertyPath(AbstractPropertyMapping.java:198)
at org.hibernate//org.hibernate.persister.entity.AbstractPropertyMapping.initPropertyPaths(AbstractPropertyMapping.java:395)
at org.hibernate//org.hibernate.persister.entity.AbstractEntityPersister.initOrdinaryPropertyPaths(AbstractEntityPersister.java:2300)
at org.hibernate//org.hibernate.persister.entity.AbstractEntityPersister.initPropertyPaths(AbstractEntityPersister.java:2347)
at org.hibernate//org.hibernate.persister.entity.AbstractEntityPersister.postConstruct(AbstractEntityPersister.java:3906)
at org.hibernate//org.hibernate.persister.entity.JoinedSubclassEntityPersister.<init>(JoinedSubclassEntityPersister.java:563)
at jdk.internal.reflect.GeneratedConstructorAccessor75.newInstance(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
at org.hibernate//org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:96)
... 135 more

This has been published as a commit comment on GitHub also.