diff --git a/front/config.form.php b/front/config.form.php
index 53c0f22..80ac93b 100644
--- a/front/config.form.php
+++ b/front/config.form.php
@@ -30,4 +30,5 @@
 
 include("../../../inc/includes.php");
 
+/** @var array $CFG_GLPI */
 Html::redirect($CFG_GLPI["root_doc"] . "/front/config.form.php?forcetab=PluginUninstallConfig\$1");
diff --git a/inc/model.class.php b/inc/model.class.php
index d4825d8..fd8b986 100644
--- a/inc/model.class.php
+++ b/inc/model.class.php
@@ -210,7 +210,6 @@ public function showForm($ID, $options = [])
         $this->showFormHeader($options);
 
         $entities = (isset($_SESSION['glpiparententities']) ? $_SESSION['glpiparententities'] : 0);
-        $entity_sons = empty($entity_sons) ? 0 : 1;
 
         echo "<tr class='tab_bg_1'><td>" . __('Name') . "</td>";
         echo "<td>";
diff --git a/inc/replace.class.php b/inc/replace.class.php
index 7a577bf..4402818 100644
--- a/inc/replace.class.php
+++ b/inc/replace.class.php
@@ -165,7 +165,7 @@ public static function replace($type, $model_id, $tab_ids, $location)
                 ]);
             }
 
-           // General Informations - NAME
+           // General Information - NAME
             if ($model->fields["replace_name"]) {
                 if ($overwrite || empty($newitem->fields['name'])) {
                     $newitem->update(
@@ -465,8 +465,8 @@ public static function replace($type, $model_id, $tab_ids, $location)
 
                    // If old item is attached in PDF/CSV
                    // Delete AND Purge it in DB
-                    if ($document_added) {
-                           $olditem->delete(['id' => $olditem_id], true);
+                    if (isset($document_added) && $document_added) {
+                       $olditem->delete(['id' => $olditem_id], true);
                     }
                     break;
 
diff --git a/inc/uninstall.class.php b/inc/uninstall.class.php
index 70d60ae..9e8112e 100644
--- a/inc/uninstall.class.php
+++ b/inc/uninstall.class.php
@@ -355,14 +355,14 @@ public static function uninstall($type, $model_id, $tab_ids, $location)
             ]);
 
             Html::changeProgressBarPosition($count, $tot + 1);
-        }
 
-       //Add line in machine's history to say that machine was uninstalled
-        self::addUninstallLog([
-            'itemtype'  => $type,
-            'items_id'  => $id,
-            'models_id' => $model_id,
-        ]);
+            //Add line in machine's history to say that machine was uninstalled
+            self::addUninstallLog([
+                'itemtype'  => $type,
+                'items_id'  => $id,
+                'models_id' => $model_id,
+            ]);
+        }
 
         Html::changeProgressBarPosition($count, $tot, __('Uninstallation successful', 'uninstall'));
 
@@ -750,8 +750,8 @@ public static function addUninstallLog($params = [])
         $changes[0] = 0;
         $changes[1] = "";
 
+        $model = new PluginUninstallModel();
         if (isset($params['models_id'])) {
-            $model = new PluginUninstallModel();
             $model->getConfig($params['models_id']);
         }
 
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..8feb506
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,19 @@
+parameters:
+    parallel:
+        maximumNumberOfProcesses: 2
+    level: 1
+    bootstrapFiles:
+        - ../../inc/based_config.php
+    paths:
+        - inc
+        - front
+        - ajax
+        - hook.php
+        - setup.php
+    scanDirectories:
+        - ../../inc
+        - ../../src
+    stubFiles:
+        - ../../stubs/glpi_constants.php
+rules:
+    - GlpiProject\Tools\PHPStan\Rules\GlobalVarTypeRule