diff --git a/src/Forum/ForumCategories.php b/src/Forum/ForumCategories.php
index 1d89ce5..d8d4def 100644
--- a/src/Forum/ForumCategories.php
+++ b/src/Forum/ForumCategories.php
@@ -12,11 +12,9 @@ use Misuzu\Pagination;
 use Misuzu\Users\UserInfo;
 
 class ForumCategories {
-    private IDbConnection $dbConn;
     private DbStatementCache $cache;
 
     public function __construct(IDbConnection $dbConn) {
-        $this->dbConn = $dbConn;
         $this->cache = new DbStatementCache($dbConn);
     }
 
diff --git a/src/Messages/MessagesDatabase.php b/src/Messages/MessagesDatabase.php
index c6cab4a..cdf8646 100644
--- a/src/Messages/MessagesDatabase.php
+++ b/src/Messages/MessagesDatabase.php
@@ -11,7 +11,7 @@ use Misuzu\Users\UserInfo;
 class MessagesDatabase {
     private DbStatementCache $cache;
 
-    public function __construct(private IDbConnection $dbConn) {
+    public function __construct(IDbConnection $dbConn) {
         $this->cache = new DbStatementCache($dbConn);
     }
 
diff --git a/src/Messages/MessagesRoutes.php b/src/Messages/MessagesRoutes.php
index f807deb..c8af1f8 100644
--- a/src/Messages/MessagesRoutes.php
+++ b/src/Messages/MessagesRoutes.php
@@ -556,9 +556,9 @@ class MessagesRoutes extends RouteHandler {
             return 400;
 
         $content = $request->getContent();
-        $messages = explode(',', (string)$content->getParam('messages'));
 
-        if(empty($messages))
+        $messages = (string)$content->getParam('messages');
+        if($messages === '')
             return [
                 'error' => [
                     'name' => 'msgs:empty',
@@ -566,6 +566,8 @@ class MessagesRoutes extends RouteHandler {
                 ],
             ];
 
+        $messages = explode(',', $messages);
+
         $this->msgsCtx->getDatabase()->deleteMessages(
             $this->authInfo->getUserInfo(),
             $messages
@@ -581,9 +583,9 @@ class MessagesRoutes extends RouteHandler {
             return 400;
 
         $content = $request->getContent();
-        $messages = explode(',', (string)$content->getParam('messages'));
 
-        if(empty($messages))
+        $messages = (string)$content->getParam('messages');
+        if($messages === '')
             return [
                 'error' => [
                     'name' => 'msgs:empty',
@@ -591,6 +593,8 @@ class MessagesRoutes extends RouteHandler {
                 ],
             ];
 
+        $messages = explode(',', $messages);
+
         $this->msgsCtx->getDatabase()->restoreMessages(
             $this->authInfo->getUserInfo(),
             $messages
@@ -606,9 +610,9 @@ class MessagesRoutes extends RouteHandler {
             return 400;
 
         $content = $request->getContent();
-        $messages = explode(',', (string)$content->getParam('messages'));
 
-        if(empty($messages))
+        $messages = (string)$content->getParam('messages');
+        if($messages === '')
             return [
                 'error' => [
                     'name' => 'msgs:empty',
@@ -616,6 +620,8 @@ class MessagesRoutes extends RouteHandler {
                 ],
             ];
 
+        $messages = explode(',', $messages);
+
         $this->msgsCtx->getDatabase()->nukeMessages(
             $this->authInfo->getUserInfo(),
             $messages
diff --git a/src/RoutingErrorHandler.php b/src/RoutingErrorHandler.php
index 32bfa92..24c6f6f 100644
--- a/src/RoutingErrorHandler.php
+++ b/src/RoutingErrorHandler.php
@@ -14,7 +14,7 @@ class RoutingErrorHandler extends HtmlErrorHandler {
 
         if($code === 500 || $code === 503) {
             $response->setTypeHTML();
-            $response->setContent(file_get_contents('%s/%03d.html', MSZ_TEMPLATES, $code));
+            $response->setContent(file_get_contents(sprintf('%s/%03d.html', MSZ_TEMPLATES, $code)));
             return;
         }
 
diff --git a/src/Users/ModNoteInfo.php b/src/Users/ModNoteInfo.php
index c6b7055..c25b621 100644
--- a/src/Users/ModNoteInfo.php
+++ b/src/Users/ModNoteInfo.php
@@ -18,7 +18,7 @@ class ModNoteInfo {
         return new ModNoteInfo(
             noteId: $result->getString(0),
             userId: $result->getString(1),
-            authorId: $result->getIntegerOrNull(2),
+            authorId: $result->getStringOrNull(2),
             created: $result->getInteger(3),
             title: $result->getString(4),
             body: $result->getString(5)
diff --git a/src/Users/UserInfo.php b/src/Users/UserInfo.php
index fe54263..5484a21 100644
--- a/src/Users/UserInfo.php
+++ b/src/Users/UserInfo.php
@@ -47,7 +47,7 @@ class UserInfo {
             created: $result->getInteger(9),
             lastActive: $result->getIntegerOrNull(10),
             deleted: $result->getIntegerOrNull(11),
-            displayRoleId: $result->getIntegerOrNull(12),
+            displayRoleId: $result->getStringOrNull(12),
             totpKey: $result->getStringOrNull(13),
             aboutContent: $result->getStringOrNull(14),
             aboutParser: $result->getInteger(15),