diff --git a/workflow/engine/src/BusinessModel/ProcessPermissions.php b/workflow/engine/src/BusinessModel/ProcessPermissions.php
index 2f24ac291..585a2f264 100644
--- a/workflow/engine/src/BusinessModel/ProcessPermissions.php
+++ b/workflow/engine/src/BusinessModel/ProcessPermissions.php
@@ -232,15 +232,21 @@ class ProcessPermissions
                     $sObjectUID = '';
                     break;
                 case 'DYNAFORM':
-                    $this->validateDynUid($data['DYNAFORMS']);
+                    if ($data['DYNAFORMS'] != '') {
+                        $this->validateDynUid($data['DYNAFORMS']);
+                    }
                     $sObjectUID = $data['DYNAFORMS'];
                     break;
                 case 'INPUT':
-                    $this->validateInpUid($data['INPUTS']);
+                    if ($data['INPUTS'] != '') {
+                        $this->validateInpUid($data['INPUTS']);
+                    }
                     $sObjectUID = $data['INPUTS'];
                     break;
                 case 'OUTPUT':
-                    $this->validateOutUid($data['OUTPUTS']);
+                    if ($data['OUTPUTS'] != '') {
+                        $this->validateOutUid($data['OUTPUTS']);
+                    }
                     $sObjectUID = $data['OUTPUTS'];
                     break;
             }
@@ -417,6 +423,9 @@ class ProcessPermissions
     public function validateDynUid($dyn_uid)
     {
         $dyn_uid = trim($dyn_uid);
+        if ($dyn_uid == '') {
+            throw (new \Exception("The dynaform with dynaforms: '' does not exist."));
+        }
         $oDynaform = new \Dynaform();
         if (!($oDynaform->dynaformExists($dyn_uid))) {
             throw (new \Exception("The dynaform with dynaforms: '$dyn_uid' does not exist."));
@@ -436,6 +445,9 @@ class ProcessPermissions
     public function validateInpUid($inp_uid)
     {
         $inp_uid = trim($inp_uid);
+        if ($inp_uid == '') {
+            throw (new \Exception("The input with inputs: '' does not exist."));
+        }
         $oInputDocument = new \InputDocument();
         if (!($oInputDocument->InputExists($inp_uid))) {
             throw (new \Exception("The input with inputs: '$inp_uid' does not exist."));
@@ -455,6 +467,9 @@ class ProcessPermissions
     public function validateOutUid($out_uid)
     {
         $out_uid = trim($out_uid);
+        if ($out_uid == '') {
+            throw (new \Exception("The output with outputs: '' does not exist."));
+        }
         $oOutputDocument = new \OutputDocument();
         if (!($oOutputDocument->OutputExists($out_uid))) {
             throw (new \Exception("The output with outputs: '$out_uid' does not exist."));