fix small issues, move wrong placed menu item

src/Application/Controller/Admin/AdminOrder.php

@@ -19,6 +19,7 @@ use D3\Linkmobility4OXID\Application\Model\Exceptions\noRecipientFoundException;
 use D3\Linkmobility4OXID\Application\Model\Exceptions\successfullySentException;
 use D3\Linkmobility4OXID\Application\Model\OrderRecipients;
 use D3\Linkmobility4OXID\Application\Model\Sms;
+use D3\LinkmobilityClient\Response\ResponseInterface;
 use D3\LinkmobilityClient\ValueObject\Recipient;
 use Exception;
 use OxidEsales\Eshop\Application\Controller\Admin\AdminController;
@@ -90,10 +91,11 @@ class AdminOrder extends AdminController
                     oxNew(successfullySentException::class, $sms->getResponse()->getSmsCount())
                 );
             } else {
+                $errorMsg = $sms->getResponse() instanceof ResponseInterface ? $sms->getResponse()->getErrorMessage() : 'no response';
                 Registry::getUtilsView()->addErrorToDisplay(
                     sprintf(
                         Registry::getLang()->translateString('D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND'),
-                        $sms->getResponse()->getErrorMessage()
+                        $errorMsg
                     )
                 );
             }

src/Application/Controller/Admin/AdminUser.php

@@ -18,6 +18,7 @@ namespace D3\Linkmobility4OXID\Application\Controller\Admin;
 use D3\Linkmobility4OXID\Application\Model\Exceptions\noRecipientFoundException;
 use D3\Linkmobility4OXID\Application\Model\Sms;
 use D3\Linkmobility4OXID\Application\Model\UserRecipients;
+use D3\LinkmobilityClient\Response\ResponseInterface;
 use D3\LinkmobilityClient\ValueObject\Recipient;
 use Exception;
 use OxidEsales\Eshop\Application\Controller\Admin\AdminController;
@@ -93,10 +94,11 @@ class AdminUser extends AdminController
                 )
             );
         } else {
+            $errorMsg = $sms->getResponse() instanceof ResponseInterface ? $sms->getResponse()->getErrorMessage() : 'no response';
             Registry::getUtilsView()->addErrorToDisplay(
                 sprintf(
                     Registry::getLang()->translateString('D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND'),
-                    $sms->getResponse()->getErrorMessage()
+                    $errorMsg
                 )
             );
         }

src/Application/Model/OrderRecipients.php

@@ -40,7 +40,7 @@ class OrderRecipients
     public function getSmsRecipient(): Recipient
     {
         foreach ($this->getSmsRecipientFields() as $phoneFieldName => $countryIdFieldName) {
-            $content = trim($this->order->getFieldData($phoneFieldName));
+            $content = trim((string) $this->order->getFieldData($phoneFieldName));
 
             if (strlen($content)) {
                 $country = oxNew(Country::class);

src/menu.xml

@@ -5,7 +5,9 @@
             <SUBMENU id="mxusers" cl="admin_user" list="user_list">
                 <TAB id="tbcluser_linkmobility" cl="d3linkmobility_user" />
             </SUBMENU>
-            <SUBMENU id="mxorders" cl="admin_orders" list="order_list">
+        </MAINMENU>
+        <MAINMENU id="mxorders">
+            <SUBMENU id="mxdisplayorders" cl="admin_order" list="order_list">
                 <TAB id="tbclorder_linkmobility" cl="d3linkmobility_order" />
             </SUBMENU>
         </MAINMENU>