HHH-19307 - Fix for issue

Signed-off-by: Jan Schatteman <[email protected]>

Author: jrenaat

hibernate-core/src/main/java/org/hibernate/boot/internal/InFlightMetadataCollectorImpl.java

@@ -1836,6 +1836,11 @@ private void processFkSecondPassesInOrder() {
 			if ( sp.isInPrimaryKey() ) {
 				final String referenceEntityName = sp.getReferencedEntityName();
 				final PersistentClass classMapping = getEntityBinding( referenceEntityName );
+				if ( classMapping == null ) {
+					throw new HibernateException(
+							"Primary key referenced an unknown entity : " + referenceEntityName
+					);
+				}
 				final String dependentTable = classMapping.getTable().getQualifiedTableName().render();
 				if ( !isADependencyOf.containsKey( dependentTable ) ) {
 					isADependencyOf.put( dependentTable, new HashSet<>() );