Index: groovy/grails/orm/hibernate/cfg/GrailsDomainBinder.java
===================================================================
--- groovy/grails/orm/hibernate/cfg/GrailsDomainBinder.java	(revision 6822)
+++ groovy/grails/orm/hibernate/cfg/GrailsDomainBinder.java	(working copy)
@@ -1629,7 +1629,7 @@
 	}
 
     private static boolean isBidirectionalManyToOneWithListMapping(GrailsDomainClassProperty grailsProperty, Property prop) {
-        return grailsProperty.isBidirectional() && prop.getValue() instanceof ManyToOne && List.class.isAssignableFrom(grailsProperty.getOtherSide().getType());
+        return grailsProperty.getOtherSide() !=null && grailsProperty.isBidirectional() && prop.getValue() instanceof ManyToOne && List.class.isAssignableFrom(grailsProperty.getOtherSide().getType());
     }
 
     private static void setCascadeBehaviour(GrailsDomainClassProperty grailsProperty, Property prop) {