diff --git a/htdocs/exports/class/export.class.php b/htdocs/exports/class/export.class.php
index 622f26506f9..07199f815d8 100644
--- a/htdocs/exports/class/export.class.php
+++ b/htdocs/exports/class/export.class.php
@@ -233,8 +233,7 @@ class Export
 			// pour ne pas a gerer le nombre de condition
 			foreach ($array_filterValue as $key => $value)
 			{
-				if (!empty($value))
-					$sqlWhere.=" and ".$this->build_filterQuery($this->array_export_TypeFields[0][$key], $key, $array_filterValue[$key]);
+				if ($value != '') $sqlWhere.=" and ".$this->build_filterQuery($this->array_export_TypeFields[0][$key], $key, $array_filterValue[$key]);
 			}
 			$sql.=$sqlWhere;
 		}
@@ -248,7 +247,7 @@ class Export
 	 *
 	 *      @param		string	$TypeField		Type of Field to filter
 	 *      @param		string	$NameField		Name of the field to filter
-	 *      @param		string	$ValueField		Initial value of the field to filter
+	 *      @param		string	$ValueField		Value of the field for filter. Must not be ''
 	 *      @return		string					sql string of then field ex : "field='xxx'>"
 	 */
 	function build_filterQuery($TypeField, $NameField, $ValueField)