diff --git a/api/ApplicationContext.php b/api/ApplicationContext.php
index 40f8d002..8dbb6079 100644
--- a/api/ApplicationContext.php
+++ b/api/ApplicationContext.php
@@ -51,66 +51,51 @@ class ApplicationContext {
     function __construct() {
         $this->get = array();
 
-        // Permissions
         $this->get[PermissionChecker::class] = new PermissionChecker();
-
-        // Settings
         $this->get[ModsForHeskSettingsGateway::class] = new ModsForHeskSettingsGateway();
-
-        // API Checker
-        $this->get[ApiChecker::class] = new ApiChecker($this->get[ModsForHeskSettingsGateway::class]);
-
-        // Custom Navigation
         $this->get[CustomNavElementGateway::class] = new CustomNavElementGateway();
-        $this->get[CustomNavElementHandler::class] = new CustomNavElementHandler($this->get[CustomNavElementGateway::class]);
-
-        // Logging
         $this->get[LoggingGateway::class] = new LoggingGateway();
-
-        // Verified Email Checker
         $this->get[VerifiedEmailGateway::class] = new VerifiedEmailGateway();
-        $this->get[VerifiedEmailChecker::class] = new VerifiedEmailChecker($this->get[VerifiedEmailGateway::class]);
-
-        // Users
         $this->get[UserGateway::class] = new UserGateway();
-        $this->get[UserContextBuilder::class] = new UserContextBuilder($this->get[UserGateway::class]);
-
-        // Categories
         $this->get[CategoryGateway::class] = new CategoryGateway();
+        $this->get[BanGateway::class] = new BanGateway();
+        $this->get[StatusGateway::class] = new StatusGateway();
+        $this->get[BasicEmailSender::class] = new BasicEmailSender();
+        $this->get[MailgunEmailSender::class] = new MailgunEmailSender();
+        $this->get[EmailTemplateRetriever::class] = new EmailTemplateRetriever();
+        $this->get[TicketGateway::class] = new TicketGateway();
+        $this->get[FileWriter::class] = new FileWriter();
+        $this->get[FileReader::class] = new FileReader();
+        $this->get[FileDeleter::class] = new FileDeleter();
+        $this->get[AttachmentGateway::class] = new AttachmentGateway();
+
+        $this->get[ApiChecker::class] = new ApiChecker($this->get[ModsForHeskSettingsGateway::class]);
+        $this->get[CustomNavElementHandler::class] = new CustomNavElementHandler($this->get[CustomNavElementGateway::class]);
+        $this->get[VerifiedEmailChecker::class] = new VerifiedEmailChecker($this->get[VerifiedEmailGateway::class]);
+        $this->get[UserContextBuilder::class] = new UserContextBuilder($this->get[UserGateway::class]);
+        $this->get[BanRetriever::class] = new BanRetriever($this->get[BanGateway::class]);
+        $this->get[UserToTicketChecker::class] = new UserToTicketChecker($this->get[UserGateway::class]);
+        $this->get[StatusRetriever::class] = new StatusRetriever($this->get[StatusGateway::class]);
+        $this->get[SettingsRetriever::class] = new SettingsRetriever($this->get[ModsForHeskSettingsGateway::class]);
+        $this->get[TicketValidators::class] = new TicketValidators($this->get[TicketGateway::class]);
+        $this->get[TrackingIdGenerator::class] = new TrackingIdGenerator($this->get[TicketGateway::class]);
+        $this->get[Autoassigner::class] = new Autoassigner($this->get[CategoryGateway::class], $this->get[UserGateway::class]);
         $this->get[CategoryRetriever::class] = new CategoryRetriever($this->get[CategoryGateway::class],
             $this->get[ModsForHeskSettingsGateway::class]);
         $this->get[CategoryHandler::class] = new CategoryHandler(
             $this->get[CategoryGateway::class],
+            $this->get[TicketGateway::class],
             $this->get[PermissionChecker::class],
             $this->get[ModsForHeskSettingsGateway::class]);
-
-        // Bans
-        $this->get[BanGateway::class] = new BanGateway();
-        $this->get[BanRetriever::class] = new BanRetriever($this->get[BanGateway::class]);
-
-        // Statuses
-        $this->get[StatusGateway::class] = new StatusGateway();
-
-        // Email Sender
-        $this->get[EmailTemplateRetriever::class] = new EmailTemplateRetriever();
         $this->get[EmailTemplateParser::class] = new EmailTemplateParser($this->get[StatusGateway::class],
             $this->get[CategoryGateway::class],
             $this->get[UserGateway::class],
             $this->get[EmailTemplateRetriever::class]);
-        $this->get[BasicEmailSender::class] = new BasicEmailSender();
-        $this->get[MailgunEmailSender::class] = new MailgunEmailSender();
         $this->get[EmailSenderHelper::class] = new EmailSenderHelper($this->get[EmailTemplateParser::class],
             $this->get[BasicEmailSender::class],
             $this->get[MailgunEmailSender::class]);
-
-        // Tickets
-        $this->get[UserToTicketChecker::class] = new UserToTicketChecker($this->get[UserGateway::class]);
-        $this->get[TicketGateway::class] = new TicketGateway();
         $this->get[TicketRetriever::class] = new TicketRetriever($this->get[TicketGateway::class],
             $this->get[UserToTicketChecker::class]);
-        $this->get[TicketValidators::class] = new TicketValidators($this->get[TicketGateway::class]);
-        $this->get[TrackingIdGenerator::class] = new TrackingIdGenerator($this->get[TicketGateway::class]);
-        $this->get[Autoassigner::class] = new Autoassigner($this->get[CategoryGateway::class], $this->get[UserGateway::class]);
         $this->get[NewTicketValidator::class] = new NewTicketValidator($this->get[CategoryRetriever::class],
             $this->get[BanRetriever::class],
             $this->get[TicketValidators::class]);
@@ -123,10 +108,6 @@ class ApplicationContext {
             $this->get[EmailSenderHelper::class],
             $this->get[UserGateway::class],
             $this->get[ModsForHeskSettingsGateway::class]);
-        $this->get[FileWriter::class] = new FileWriter();
-        $this->get[FileReader::class] = new FileReader();
-        $this->get[FileDeleter::class] = new FileDeleter();
-        $this->get[AttachmentGateway::class] = new AttachmentGateway();
         $this->get[AttachmentHandler::class] = new AttachmentHandler($this->get[TicketGateway::class],
             $this->get[AttachmentGateway::class],
             $this->get[FileWriter::class],
@@ -142,11 +123,5 @@ class ApplicationContext {
                 $this->get[AttachmentHandler::class]);
         $this->get[TicketEditor::class] =
             new TicketEditor($this->get[TicketGateway::class], $this->get[UserToTicketChecker::class]);
-
-        // Statuses
-        $this->get[StatusRetriever::class] = new StatusRetriever($this->get[StatusGateway::class]);
-
-        // Settings
-        $this->get[SettingsRetriever::class] = new SettingsRetriever($this->get[ModsForHeskSettingsGateway::class]);
     }
 }
\ No newline at end of file
diff --git a/api/BusinessLogic/Categories/CategoryHandler.php b/api/BusinessLogic/Categories/CategoryHandler.php
index 2df16882..8c6c42ca 100644
--- a/api/BusinessLogic/Categories/CategoryHandler.php
+++ b/api/BusinessLogic/Categories/CategoryHandler.php
@@ -11,19 +11,24 @@ use BusinessLogic\Security\UserPrivilege;
 use BusinessLogic\ValidationModel;
 use DataAccess\Categories\CategoryGateway;
 use DataAccess\Settings\ModsForHeskSettingsGateway;
+use DataAccess\Tickets\TicketGateway;
 
 class CategoryHandler {
     /* @var $categoryGateway CategoryGateway */
     private $categoryGateway;
 
+    /* @var $ticketGateway TicketGateway */
+    private $ticketGateway;
+
     /* @var $permissionChecker PermissionChecker */
     private $permissionChecker;
 
     /* @var $modsForHeskSettingsGateway ModsForHeskSettingsGateway */
     private $modsForHeskSettingsGateway;
 
-    function __construct($categoryGateway, $permissionChecker, $modsForHeskSettingsGateway) {
+    function __construct($categoryGateway, $ticketGateway, $permissionChecker, $modsForHeskSettingsGateway) {
         $this->categoryGateway = $categoryGateway;
+        $this->ticketGateway = $ticketGateway;
         $this->permissionChecker = $permissionChecker;
         $this->modsForHeskSettingsGateway = $modsForHeskSettingsGateway;
     }
@@ -149,6 +154,11 @@ class CategoryHandler {
             throw new AccessViolationException('User cannot manage categories!');
         }
 
+        if ($id === 1) {
+            throw new \Exception("Category 1 cannot be deleted!");
+        }
+
+        $this->ticketGateway->moveTicketsToDefaultCategory($id, $heskSettings);
         $this->categoryGateway->deleteCategory($id, $heskSettings);
         $this->categoryGateway->resortAllCategories($heskSettings);
     }
diff --git a/api/DataAccess/Tickets/TicketGateway.php b/api/DataAccess/Tickets/TicketGateway.php
index 1645618b..a14d623e 100644
--- a/api/DataAccess/Tickets/TicketGateway.php
+++ b/api/DataAccess/Tickets/TicketGateway.php
@@ -358,4 +358,14 @@ class TicketGateway extends CommonDao {
 
         $this->close();
     }
+
+    function moveTicketsToDefaultCategory($oldCategoryId, $heskSettings) {
+        $this->init();
+
+        hesk_dbQuery("UPDATE `" . hesk_dbEscape($heskSettings['db_pfix']) . "tickets`
+            SET `category` = 1
+            WHERE `category` = " . intval($oldCategoryId));
+
+        $this->close();
+    }
 }
\ No newline at end of file
diff --git a/internal-api/js/manage-categories.js b/internal-api/js/manage-categories.js
index 521198d8..853e06e1 100644
--- a/internal-api/js/manage-categories.js
+++ b/internal-api/js/manage-categories.js
@@ -119,6 +119,10 @@ function loadTable() {
                         .attr('title', mfhLang.text('geco'));
                 }
 
+                if (this.id === 1) {
+                    $template.find('[data-action="delete"]').hide();
+                }
+
                 $tableBody.append($template);
 
                 categories[this.id] = this;