HHH-7518

hibernate-ehcache/src/main/java/org/hibernate/cache/ehcache/management/impl/ProviderMBeanRegistrationHelper.java

@@ -149,7 +149,7 @@ private SessionFactory locateSessionFactory() {
                     throw new RuntimeException( "Expected 'sessionFactoryMap' field on " + SessionFactoryRegistry.class.getName() );
                 }
                 instancesField.setAccessible( true );
-                Map map = (Map) instancesField.get( null );
+                Map map = (Map) instancesField.get( SessionFactoryRegistry.INSTANCE );
                 if ( map == null ) {
                     return null;
                 }