diff --git a/process/Sql_lib/process.js b/process/Sql_lib/process.js
index b998ddb47ff69b040d908fa21fa0c9aa82250aa1..9e9dfd908b37466d0fcf8724ecf5b3878edcdc96 100644
--- a/process/Sql_lib/process.js
+++ b/process/Sql_lib/process.js
@@ -1455,7 +1455,7 @@ SqlBuilder.prototype._addWhere = function(pFieldOrCond, pValue, pMandatory, pCon
             pCondition = resCond[0];
             pFieldType = pFieldType || resCond[1];
         }
-        else if(typeof(resCond) == "string")
+        else if(Utils.isString(pCondition))
         {
             pCondition = resCond;
         }