diff --git a/workflow/engine/methods/cases/caseMessageHistory_Ajax.php b/workflow/engine/methods/cases/caseMessageHistory_Ajax.php
index 55a357931..73fbcc018 100644
--- a/workflow/engine/methods/cases/caseMessageHistory_Ajax.php
+++ b/workflow/engine/methods/cases/caseMessageHistory_Ajax.php
@@ -58,23 +58,36 @@ if ($actionAjax == 'messageHistoryGridList_JXP') {
 
     $delIndex = array();
     $respMess = "";
-    if (count($respView['MSGS_HISTORY'])>0) {
-        $respMess = $respView['MSGS_HISTORY']['PERMISSION'];
-        $delIndex = $respView['MSGS_HISTORY']['DEL_INDEX'];
+
+    if (count($respView["MSGS_HISTORY"]) > 0) {
+        $respMess = $respView["MSGS_HISTORY"]["PERMISSION"];
+
+        if (isset($respView["MSGS_HISTORY"]["DEL_INDEX"])) {
+            $delIndex = $respView["MSGS_HISTORY"]["DEL_INDEX"];
+        }
+
     } else {
-        if (count($respBlock['MSGS_HISTORY'])>0) {
-            $respMess = $respBlock['MSGS_HISTORY']['PERMISSION'];
-            $delIndex = $respView['MSGS_HISTORY']['DEL_INDEX'];
+        if (count($respBlock["MSGS_HISTORY"]) > 0) {
+            $respMess = $respBlock["MSGS_HISTORY"]["PERMISSION"];
+
+            if (isset($respBlock["MSGS_HISTORY"]["DEL_INDEX"])) {
+                $delIndex = $respBlock["MSGS_HISTORY"]["DEL_INDEX"];
+            }
+
         } else {
-            if (count($respResend['MSGS_HISTORY'])>0) {
-                $respMess = $respResend['MSGS_HISTORY']['PERMISSION'];
-                $delIndex = $respView['MSGS_HISTORY']['DEL_INDEX'];
+            if (count($respResend["MSGS_HISTORY"]) > 0) {
+
+                $respMess = $respResend["MSGS_HISTORY"]["PERMISSION"];
+
+                if (isset($respBlock["MSGS_HISTORY"]["DEL_INDEX"])) {
+                    $delIndex = $respBlock["MSGS_HISTORY"]["DEL_INDEX"];
+                }
             }
         }
     }
 
     foreach ($appMessageArray as $index => $value) {
-        if (($appMessageArray[$index]['APP_MSG_SHOW_MESSAGE'] == 1  && $respMess != 'BLOCK' ) && 
+        if (($appMessageArray[$index]['APP_MSG_SHOW_MESSAGE'] == 1  && $respMess != 'BLOCK' ) &&
             ($appMessageArray[$index]['DEL_INDEX'] == 0 || in_array($appMessageArray[$index]['DEL_INDEX'], $delIndex ))) {
             $appMessageArray[$index]['ID_MESSAGE'] = $appMessageArray[$index]['APP_UID'] . '_' . $appMessageArray[$index]['APP_MSG_UID'];
             if ($respMess == 'BLOCK' || $respMess == '') {