Index: content.migrate.inc
===================================================================
--- content.migrate.inc	(revision 949)
+++ content.migrate.inc	(working copy)
@@ -158,17 +158,18 @@
           }
           // Set the correct node field values.
           if (isset($field_name) && isset($node->$field_name) && is_array($node->$field_name)) {
-            $node->$field_name += array($delta => array($column => $value));
+            $node_field = &$node->$field_name;
+            $node_field[$delta] += array($column => $value);
           }
           else {
             $node->$field_name = array($delta => array($column => $value));
           }
         }
-      }
 
-      // Unset the dummy column value.
-      if (isset($node->$dummy_name)) {
-        unset($node->$dummy_name);
+        // Unset the dummy column value.
+        if (isset($node->$dummy_name)) {
+          unset($node->$dummy_name);
+        }
       }
     }
     // Handle defaulting of date "to" from "from"