diff --git a/workflow/engine/methods/cases/cases_Derivate.php b/workflow/engine/methods/cases/cases_Derivate.php
index b7fee6e51..32f9f6b99 100644
--- a/workflow/engine/methods/cases/cases_Derivate.php
+++ b/workflow/engine/methods/cases/cases_Derivate.php
@@ -69,7 +69,10 @@ G::LoadClass( 'pmScript' );
 G::LoadClass( 'case' );
 G::LoadClass( 'derivation' );
 
-//require_once 'classes/model/Event.php';
+//If didn't is not submitted any variable and the $_POST is empty
+if (!isset($_POST['form'])) {
+    $_POST['form'] = array();
+}
 
 /* GET , POST & $_SESSION Vars */
 /* Process the info */
diff --git a/workflow/engine/methods/cases/cases_Save.php b/workflow/engine/methods/cases/cases_Save.php
index 3f28a2c2b..72e9d8891 100644
--- a/workflow/engine/methods/cases/cases_Save.php
+++ b/workflow/engine/methods/cases/cases_Save.php
@@ -57,7 +57,12 @@ if (isset( $_SESSION['STEP_POSITION'] )) {
     unset( $_SESSION['STEP_POSITION'] );
 }
 
-    /* Process */
+//If didn't is not submitted any variable and the $_POST is empty
+if (!isset($_POST['form'])) {
+    $_POST['form'] = array();
+}
+
+/* Process */
 try {
     $oCase = new Cases();
     $aData = $oCase->startCase( $_POST['form']['TAS_UID'], $_SESSION['USER_LOGGED'] );
diff --git a/workflow/engine/methods/cases/cases_SaveData.php b/workflow/engine/methods/cases/cases_SaveData.php
index 30c3e5cc7..d0c925e85 100644
--- a/workflow/engine/methods/cases/cases_SaveData.php
+++ b/workflow/engine/methods/cases/cases_SaveData.php
@@ -103,6 +103,11 @@ try {
 
     $arrayVariableDocumentToDelete = [];
 
+    //If didn't is not submitted any variable and the $_POST is empty
+    if (!isset($_POST['form'])) {
+        $_POST['form'] = array();
+    }
+
     if (array_key_exists('__VARIABLE_DOCUMENT_DELETE__', $_POST['form'])) {
         if (is_array($_POST['form']['__VARIABLE_DOCUMENT_DELETE__']) && !empty($_POST['form']['__VARIABLE_DOCUMENT_DELETE__'])) {
             $arrayVariableDocumentToDelete = $_POST['form']['__VARIABLE_DOCUMENT_DELETE__'];
diff --git a/workflow/engine/methods/cases/cases_SaveDataSupervisor.php b/workflow/engine/methods/cases/cases_SaveDataSupervisor.php
index eeeca0c1b..79c8b13de 100644
--- a/workflow/engine/methods/cases/cases_SaveDataSupervisor.php
+++ b/workflow/engine/methods/cases/cases_SaveDataSupervisor.php
@@ -27,6 +27,11 @@ $dynaForm = DynaformPeer::retrieveByPK($_GET["UID"]);
 
 $flagDynaFormNewVersion = !is_null($dynaForm) && $dynaForm->getDynVersion() == 2;
 
+//If didn't is not submitted any variable and the $_POST is empty
+if (!isset($_POST['form'])) {
+    $_POST['form'] = array();
+}
+
 if ($flagDynaFormNewVersion) {
     $dataForm = $_POST["form"];
 }
@@ -205,8 +210,9 @@ if (isset( $_FILES["form"]["name"] ) && count( $_FILES["form"]["name"] ) > 0) {
 		}
 	}
 }
-
+//Define the STEP_POSITION
+$ex = isset($_GET['ex']) ? $_GET['ex'] : 0;
 //go to the next step
 $aNextStep = $oCase->getNextSupervisorStep( $_SESSION['PROCESS'], $_SESSION['STEP_POSITION'] );
-G::header( 'Location: cases_StepToRevise?type=DYNAFORM&ex=' . $_GET['ex'] . '&PRO_UID=' . $_SESSION['PROCESS'] . '&DYN_UID=' . $aNextStep['UID'] . '&APP_UID=' . $_SESSION['APPLICATION'] . '&position=' . $aNextStep['POSITION'] . '&DEL_INDEX=' . $_SESSION['INDEX'] );
+G::header( 'Location: cases_StepToRevise?type=DYNAFORM&ex=' . $ex . '&PRO_UID=' . $_SESSION['PROCESS'] . '&DYN_UID=' . $aNextStep['UID'] . '&APP_UID=' . $_SESSION['APPLICATION'] . '&position=' . $aNextStep['POSITION'] . '&DEL_INDEX=' . $_SESSION['INDEX'] );
 die();
\ No newline at end of file
diff --git a/workflow/engine/methods/cases/saveForm.php b/workflow/engine/methods/cases/saveForm.php
index 3187ad79c..3cb195ead 100644
--- a/workflow/engine/methods/cases/saveForm.php
+++ b/workflow/engine/methods/cases/saveForm.php
@@ -43,6 +43,11 @@ try {
     $Fields["APP_DATA"] = array_merge( $Fields["APP_DATA"], G::getSystemConstants() );
     $Fields["APP_DATA"] = array_merge( $Fields["APP_DATA"], $_POST["form"] );
 
+    //If didn't is not submitted any variable and the $_POST is empty
+    if (!isset($_POST['form'])) {
+        $_POST['form'] = array();
+    }
+
     //save data in PM Tables if necessary
     $newValues = array ();
     foreach ($_POST['form'] as $sField => $sAux) {