diff --git a/tapestry-hibernate/src/main/java/org/apache/tapestry5/hibernate/web/modules/HibernateModule.java b/tapestry-hibernate/src/main/java/org/apache/tapestry5/hibernate/web/modules/HibernateModule.java
index 0fa210926..8ca7403bc 100644
--- a/tapestry-hibernate/src/main/java/org/apache/tapestry5/hibernate/web/modules/HibernateModule.java
+++ b/tapestry-hibernate/src/main/java/org/apache/tapestry5/hibernate/web/modules/HibernateModule.java
@@ -102,7 +102,7 @@ public static void contributeValueEncoderSource(
         for (EntityType<?> entityType : entities)
         {
             Class<?> entityClass = entityType.getJavaType();
-            if (entityClass != null)
+            if (entityClass != null && entityType.hasSingleIdAttribute())
             {
                 SingularAttribute<?, ?> id = entityType.getId(entityType.getIdType().getJavaType());
                 final String idenfierPropertyName = id.getName();