diff --git a/process/Keyword_lib/process.js b/process/Keyword_lib/process.js
index 8f1892d8fc0780f6986f090a24d2b7da0c48c2ac..7aaf4eb03fedb47c4789aecfe124fbc0403dad33 100644
--- a/process/Keyword_lib/process.js
+++ b/process/Keyword_lib/process.js
@@ -94,7 +94,7 @@ KeywordUtils.getAttributeRelation = function(pKeyId, pContainerName, pAttrName,
     {
         return attributes[pAttrName];
     }
-    return pDefault ? pDefault : null;
+    return pDefault !== undefined ? pDefault : null;
 };
 
 /**