diff --git a/CHANGELOG.md b/CHANGELOG.md
index e1dce5b..e70f873 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [UNRELEASED]
+
+### Fixed
+
+- Fix rules duplication
+
 ## [2.10.1] - 2025-12-09
 
 ### Fixed
diff --git a/inc/ticket.class.php b/inc/ticket.class.php
index 677607b..17b2b19 100644
--- a/inc/ticket.class.php
+++ b/inc/ticket.class.php
@@ -102,10 +102,14 @@ public static function pre_item_update(CommonDBTM $item)
                 }
 
                 $temp_input['_disablenotif'] = true; // Disable notifications for this validation
+                $item->input['_skip_rules'] = true;
                 $input = $item->prepareInputForUpdate($temp_input);
+                $item->input['_skip_rules'] = false;
                 unset($item->input['_no_escalade_template_validation']); // Clean up flag
             } else {
+                $item->input['_skip_rules'] = true;
                 $input = $item->prepareInputForUpdate($item->input);
+                $item->input['_skip_rules'] = false;
             }
 
             if (!$input) {
diff --git a/tests/Units/TicketTest.php b/tests/Units/TicketTest.php
index 16dcd22..3eac308 100644
--- a/tests/Units/TicketTest.php
+++ b/tests/Units/TicketTest.php
@@ -39,9 +39,12 @@
 use Group_User;
 use ITILCategory;
 use PluginEscaladeTicket;
+use Rule;
+use RuleCommonITILObject;
 use Ticket;
 use Ticket_User;
 use User;
+use TicketTask;
 
 final class TicketTest extends EscaladeTestCase
 {
@@ -1257,4 +1260,79 @@ public function testHistoryButtonEscalationWithMandatoryTemplateFields()
         $group1->delete(['id' => $group1_id], true);
         $group2->delete(['id' => $group2_id], true);
     }
+
+    public function testRuleCreatesTaskWhenCategoryAssigned()
+    {
+        $this->initConfig();
+
+        // Create a task template that will be added by the rule
+        $task_template = $this->createItem('TaskTemplate', [
+            'name' => 'Rule task template',
+            'content' => '<p>Task created by rule</p>',
+            'entities_id' => 0,
+            'is_recursive' => 1,
+        ]);
+        $task_template_id = $task_template->getID();
+
+        // Create the rule that appends a task template when category is set on update
+        $rule = $this->createItem('Rule', [
+            'name' => 'Create task on category assign',
+            'sub_type' => 'RuleTicket',
+            'match' => 'AND',
+            'is_active' => 1,
+            'condition' => RuleCommonITILObject::ONUPDATE,
+            'is_recursive' => 1,
+            'entities_id' => 0,
+        ]);
+        $rule_id = $rule->getID();
+
+        $this->createItem('RuleAction', [
+            'rules_id' => $rule_id,
+            'action_type' => 'append',
+            'field' => 'task_template',
+            'value' => $task_template_id,
+        ]);
+
+        // Create a category that will trigger the rule when assigned
+        $category = $this->createItem('ITILCategory', [
+            'name' => 'Category triggering task',
+            'entities_id' => 0,
+            'is_recursive' => 1,
+        ]);
+        $category_id = $category->getID();
+
+        // Ensure the rule triggers only when the ticket category matches the created category
+        $this->createItem('RuleCriteria', [
+            'rules_id' => $rule_id,
+            'criteria' => 'itilcategories_id',
+            'condition' => Rule::PATTERN_IS,
+            'pattern' => $category_id,
+        ]);
+
+        // Create a ticket without category
+        $ticket = $this->createItem('Ticket', [
+            'name' => 'Ticket for rule test',
+            'content' => 'Content for rule test',
+            'entities_id' => 0,
+        ]);
+        $ticket_id = $ticket->getID();
+
+        $tickettask = new TicketTask();
+        $this->assertEquals(0, count($tickettask->find(['tickets_id' => $ticket_id])));
+
+        // Assign the category (update) - rule should fire and create a single task
+        $this->updateItem('Ticket', $ticket_id, [
+            'id' => $ticket_id,
+            'itilcategories_id' => $category_id,
+        ]);
+
+        $tasks = $tickettask->find(['tickets_id' => $ticket_id]);
+        $this->assertEquals(1, count($tasks));
+
+        // Clean up
+        $ticket->delete(['id' => $ticket_id], true);
+        $task_template->delete(['id' => $task_template_id], true);
+        $category->delete(['id' => $category_id], true);
+        $rule->delete(['id' => $rule_id], true);
+    }
 }