diff --git a/Admin/Installer.php b/Admin/Installer.php
index a58f3eb..f3d3567 100755
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -93,9 +93,14 @@ final class Installer extends InstallerAbstract
 
             $module->apiItemL11nTypeCreate($request, $response);
 
-            $l11nTypes[] = !\is_array($response->get('')['response'])
-                ? $response->get('')['response']->toArray()
-                : $response->get('')['response'];
+            $responseData = $response->get('');
+            if (!\is_array($responseData)) {
+                continue;
+            }
+
+            $l11nTypes[] = !\is_array($responseData['response'])
+                ? $responseData['response']->toArray()
+                : $responseData['response'];
         }
 
         return $l11nTypes;
@@ -119,6 +124,7 @@ final class Installer extends InstallerAbstract
         /** @var \Modules\ItemManagement\Controller\ApiController $module */
         $module = $app->moduleManager->getModuleInstance('ItemManagement');
 
+        /** @var array $attribute */
         foreach ($attributes as $attribute) {
             $response = new HttpResponse();
             $request  = new HttpRequest(new HttpUri(''));
@@ -133,9 +139,14 @@ final class Installer extends InstallerAbstract
 
             $module->apiItemAttributeTypeCreate($request, $response);
 
-            $itemAttrType[$attribute['name']] = !\is_array($response->get('')['response'])
-                ? $response->get('')['response']->toArray()
-                : $response->get('')['response'];
+            $responseData = $response->get('');
+            if (!\is_array($responseData)) {
+                continue;
+            }
+
+            $itemAttrType[$attribute['name']] = !\is_array($responseData['response'])
+                ? $responseData['response']->toArray()
+                : $responseData['response'];
 
             $isFirst = true;
             foreach ($attribute['l11n'] as $language => $l11n) {
@@ -181,6 +192,7 @@ final class Installer extends InstallerAbstract
         foreach ($attributes as $attribute) {
             $itemAttrValue[$attribute['name']] = [];
 
+            /** @var array $value */
             foreach ($attribute['values'] as $value) {
                 $response = new HttpResponse();
                 $request  = new HttpRequest(new HttpUri(''));
@@ -199,9 +211,14 @@ final class Installer extends InstallerAbstract
 
                 $module->apiItemAttributeValueCreate($request, $response);
 
-                $attrValue = !\is_array($response->get('')['response'])
-                    ? $response->get('')['response']->toArray()
-                    : $response->get('')['response'];
+                $responseData = $response->get('');
+                if (!\is_array($responseData)) {
+                    continue;
+                }
+
+                $attrValue = !\is_array($responseData['response'])
+                    ? $responseData['response']->toArray()
+                    : $responseData['response'];
 
                 $itemAttrValue[$attribute['name']][] = $attrValue;
 
diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 8506d40..fe1bee4 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -94,10 +94,10 @@ final class ApiController extends Controller
     private function createItemFromRequest(RequestAbstract $request) : Item
     {
         $item                = new Item();
-        $item->number        = $request->getData('number') ?? '';
+        $item->number        = (string) ($request->getData('number') ?? '');
         $item->salesPrice    = new Money($request->getData('salesprice', 'int') ?? 0);
         $item->purchasePrice = new Money($request->getData('purchaseprice', 'int') ?? 0);
-        $item->info          = $request->getData('info') ?? '';
+        $item->info          = (string) ($request->getData('info') ?? '');
         $item->parent        = ($request->getData('parent') !== null) ? (int) $request->getData('parent') : null;
 
         return $item;
@@ -161,14 +161,14 @@ final class ApiController extends Controller
     private function createItemPriceFromRequest(RequestAbstract $request) : ItemPrice
     {
         $item                       = new ItemPrice();
-        $item->currency             = $request->getData('currency') ?? '';
+        $item->currency             = (string) ($request->getData('currency') ?? '');
         $item->price                = new Money($request->getData('price', 'int') ?? 0);
         $item->minQuantity          = (int) ($request->getData('minquantity') ?? 0);
         $item->relativeDiscount     = (int) ($request->getData('relativediscount') ?? 0);
         $item->absoluteDiscount     = (int) ($request->getData('absolutediscount') ?? 0);
         $item->relativeUnitDiscount = (int) ($request->getData('relativeunitdiscount') ?? 0);
         $item->absoluteUnitDiscount = (int) ($request->getData('absoluteunitdiscount') ?? 0);
-        $item->promocode            = $request->getData('promocode') ?? '';
+        $item->promocode            = (string) ($request->getData('promocode') ?? '');
 
         $item->setStatus((int) ($request->getData('status') ?? ItemPriceStatus::ACTIVE));
 
@@ -395,7 +395,7 @@ final class ApiController extends Controller
         $attrType->setFields((int) ($request->getData('fields') ?? 0));
         $attrType->custom            = (bool) ($request->getData('custom') ?? false);
         $attrType->isRequired        = (bool) ($request->getData('is_required') ?? false);
-        $attrType->validationPattern = $request->getData('validation_pattern') ?? '';
+        $attrType->validationPattern = (string) ($request->getData('validation_pattern') ?? '');
 
         return $attrType;
     }
@@ -807,8 +807,13 @@ final class ApiController extends Controller
             return;
         }
 
-        $model = $response->get($request->uri->__toString())['response'];
-        $this->createModelRelation($request->header->account, $request->getData('id'), $model->getId(), ItemMapper::class, 'notes', '', $request->getOrigin());
+        $responseData = $response->get($request->uri->__toString());
+        if (!\is_array($responseData)) {
+            return;
+        }
+
+        $model = $responseData['response'];
+        $this->createModelRelation($request->header->account, (int) $request->getData('id'), $model->getId(), ItemMapper::class, 'notes', '', $request->getOrigin());
     }
 
     /**
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 450fa44..69f598f 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -61,7 +61,11 @@ final class BackendController extends Controller
         $view->setTemplate('/Modules/ItemManagement/Theme/Backend/attribute-type-list');
         $view->addData('nav', $this->app->moduleManager->get('Navigation')->createNavigationMid(1004801001, $request, $response));
 
-        $attributes = ItemAttributeTypeMapper::getAll()->with('l11n')->where('l11n/language', $response->getLanguage())->execute();
+        /** @var \Modules\ItemManagement\Models\ItemAttributeType[] $attributes */
+        $attributes = ItemAttributeTypeMapper::getAll()
+            ->with('l11n')
+            ->where('l11n/language', $response->getLanguage())
+            ->execute();
 
         $view->addData('attributes', $attributes);
 
@@ -86,7 +90,11 @@ final class BackendController extends Controller
         $view->setTemplate('/Modules/ItemManagement/Theme/Backend/attribute-value-list');
         $view->addData('nav', $this->app->moduleManager->get('Navigation')->createNavigationMid(1004801001, $request, $response));
 
-        $attributes = ItemAttributeValueMapper::getAll()->with('l11n')->where('l11n/language', $response->getLanguage())->execute();
+        /** @var \Modules\ItemManagement\Models\ItemAttributeValue[] $attributes */
+        $attributes = ItemAttributeValueMapper::getAll()
+            ->with('l11n')
+            ->where('l11n/language', $response->getLanguage())
+            ->execute();
 
         $view->addData('attributes', $attributes);
 
@@ -111,7 +119,12 @@ final class BackendController extends Controller
         $view->setTemplate('/Modules/ItemManagement/Theme/Backend/attribute-type');
         $view->addData('nav', $this->app->moduleManager->get('Navigation')->createNavigationMid(1004801001, $request, $response));
 
-        $attribute = ItemAttributeTypeMapper::get()->with('l11n')->where('id', (int) $request->getData('id'))->where('l11n/language', $response->getLanguage())->execute();
+        /** @var \Modules\ItemManagement\Models\ItemAttributeType $attribute */
+        $attribute = ItemAttributeTypeMapper::get()
+            ->with('l11n')
+            ->where('id', (int) $request->getData('id'))
+            ->where('l11n/language', $response->getLanguage())
+            ->execute();
 
         $view->addData('attribute', $attribute);
 
@@ -136,7 +149,12 @@ final class BackendController extends Controller
         $view->setTemplate('/Modules/ItemManagement/Theme/Backend/attribute-value');
         $view->addData('nav', $this->app->moduleManager->get('Navigation')->createNavigationMid(1004801001, $request, $response));
 
-        $attribute = ItemAttributeValueMapper::get()->with('l11n')->where('id', (int) $request->getData('id'))->where('l11n/language', $response->getLanguage())->execute();
+        /** @var \Modules\ItemManagement\Models\ItemAttributeValue $attribute */
+        $attribute = ItemAttributeValueMapper::get()
+            ->with('l11n')
+            ->where('id', (int) $request->getData('id'))
+            ->where('l11n/language', $response->getLanguage())
+            ->execute();
 
         $view->addData('attribute', $attribute);
 
@@ -161,6 +179,7 @@ final class BackendController extends Controller
         $view->setTemplate('/Modules/ItemManagement/Theme/Backend/sales-item-list');
         $view->addData('nav', $this->app->moduleManager->get('Navigation')->createNavigationMid(1004805001, $request, $response));
 
+        /** @var \Modules\ItemManagement\Models\Item[] $items */
         $items = ItemMapper::getAll()
             ->with('l11n')
             ->with('l11n/type')
@@ -315,6 +334,7 @@ final class BackendController extends Controller
         $view->setTemplate('/Modules/ItemManagement/Theme/Backend/sales-item-profile');
         $view->addData('nav', $this->app->moduleManager->get('Navigation')->createNavigationMid(1004805001, $request, $response));
 
+        /** @var \Modules\ItemManagement\Models\Item $item */
         $item = ItemMapper::get()
             ->with('l11n')
             ->with('l11n/type')
@@ -329,6 +349,7 @@ final class BackendController extends Controller
 
         $view->addData('item', $item);
 
+        /** @var \Model\Setting $settings */
         $settings = $this->app->appSettings->get(null, [
             SettingsEnum::DEFAULT_LOCALIZATION,
         ]);