diff --git a/modules/salesforce_mapping/includes/salesforce_mapping.fieldmap_type.inc b/modules/salesforce_mapping/includes/salesforce_mapping.fieldmap_type.inc
index 942ec08..7c6e128 100644
--- a/modules/salesforce_mapping/includes/salesforce_mapping.fieldmap_type.inc
+++ b/modules/salesforce_mapping/includes/salesforce_mapping.fieldmap_type.inc
@@ -312,6 +312,7 @@ function salesforce_mapping_property_fieldmap_push_value($fieldmap, $entity_wrap
     // Don't throw an exception, if we can't get the value, it probably means
     // the field is empty.
     // @TODO: Find a better way to check the validity of child wrappers.
+    $value = NULL;
   }
 
   // Salesforce wants arrays to be imploded strings.