diff --git a/workflow/engine/classes/class.wsTools.php b/workflow/engine/classes/class.wsTools.php
index 0fd712208..0717333be 100755
--- a/workflow/engine/classes/class.wsTools.php
+++ b/workflow/engine/classes/class.wsTools.php
@@ -813,7 +813,7 @@ class workspaceTools
                         $arrayData["MESS_FROM_NAME"]           = (isset($emailConfiguration["MESS_FROM_NAME"]))? $emailConfiguration["MESS_FROM_NAME"] : "";
                         $arrayData["SMTPSECURE"]               = $emailConfiguration["SMTPSecure"];
                         $arrayData["MESS_TRY_SEND_INMEDIATLY"] = (isset($emailConfiguration["MESS_TRY_SEND_INMEDIATLY"]) && ($emailConfiguration["MESS_TRY_SEND_INMEDIATLY"] . "" == "true" || $emailConfiguration["MESS_TRY_SEND_INMEDIATLY"] . "" == "1"))? 1 : 0;
-                        $arrayData["MAIL_TO"]                  = $emailConfiguration["MAIL_TO"];
+                        $arrayData["MAIL_TO"]                  = isset($emailConfiguration["MAIL_TO"]) ? $emailConfiguration["MAIL_TO"] : '';
                         $arrayData["MESS_DEFAULT"]             = (isset($emailConfiguration["MESS_ENABLED"]) && $emailConfiguration["MESS_ENABLED"] . "" == "1")? 1 : 0;
                         break;
                     case "MAIL":
diff --git a/workflow/engine/config/schema.xml b/workflow/engine/config/schema.xml
index bc8a5ee78..dd2069e7d 100755
--- a/workflow/engine/config/schema.xml
+++ b/workflow/engine/config/schema.xml
@@ -4386,7 +4386,7 @@
         <column name="MESS_FROM_NAME" type="VARCHAR" size="256" default="" />
         <column name="SMTPSECURE" type="VARCHAR" size="3" required="true" default="No" />
         <column name="MESS_TRY_SEND_INMEDIATLY" type="INTEGER" required="true" default="0" />
-        <column name="MAIL_TO" type="VARCHAR" size="256" required="true" default="" />
+        <column name="MAIL_TO" type="VARCHAR" size="256" required="false" default="" />
         <column name="MESS_DEFAULT" type="INTEGER" required="true" default="0" />
     </table>