diff --git a/server/controllers/ticket/get-authors.php b/server/controllers/ticket/get-authors.php
index 6e1c77a0..09c63c21 100644
--- a/server/controllers/ticket/get-authors.php
+++ b/server/controllers/ticket/get-authors.php
@@ -39,7 +39,7 @@ class GetAuthorsController extends Controller {
                     'error' => ERRORS::INVALID_QUERY
                 ],
                 'blackList' => [
-                    'validation' => DataValidator::oneOf(DataValidator::notBlank(),DataValidator::nullType(),DataValidator::arrayType()),
+                    'validation' => DataValidator::oneOf(DataValidator::validBlackList(),DataValidator::nullType()),
                     'error' => ERRORS::INVALID_BLACK_LIST
                 ]
             ]
diff --git a/server/libs/validations/validBlackList.php b/server/libs/validations/validBlackList.php
new file mode 100644
index 00000000..685a78ed
--- /dev/null
+++ b/server/libs/validations/validBlackList.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace CustomValidations;
+
+use Respect\Validation\Rules\AbstractRule;
+
+class ValidBlackList extends AbstractRule {
+
+    public function validate($blackList) {
+    	if(is_array(json_decode($blackList))){
+			foreach (json_decode($blackList) as $item) {
+                if(!$item->id && !$item->staff) return false;
+				if($item->staff !== 0 && $item->staff !== 1) return false;
+                if(!is_numeric($item->id)) return false;
+			}
+	        return true;
+	    }
+	    return false;
+    }
+}
\ No newline at end of file