Invalid path: 'null.id'

[thehl]

1080 [main] ERROR org.hibernate.hql.PARSER -  Invalid path: 'null.id'
1080 [main] ERROR org.hibernate.hql.PARSER - <AST>:0:0: unexpected end of subtree
1080 [main] ERROR org.hibernate.hql.PARSER -  left-hand operand of a binary operator was null
1080 [main] ERROR org.hibernate.hql.PARSER - <AST>:0:0: unexpected end of subtree
1138 [main] ERROR org.hibernate.impl.SessionFactoryImpl - Error in named query: findSensorGroupBySensorId
org.hibernate.hql.ast.QuerySyntaxException: Invalid path: 'null.id' [SELECT sgroup FROM com.pointsix.model.security.SensorGroup AS sgroup, com.pointsix.model.security.SensorGroupEntry AS entry, com.pointsix.model.sensor.Sensor WHERE Sensor.id = ?   AND entry.sensorId = Sensor.id   AND sgroup.id = entry.sensorGroupId ]

Hibernate gave me this error on my query. I'm unsure as to how to proceed.

How can one of the properties be null in this circumstance?

[thehl]

Nevermind. Figured it out. Had the sensor ID twice essentially. It must have been confusing the compiler.