diff --git a/files/lib/data/room/RoomAction.class.php b/files/lib/data/room/RoomAction.class.php
index c4d11f6..5686950 100644
--- a/files/lib/data/room/RoomAction.class.php
+++ b/files/lib/data/room/RoomAction.class.php
@@ -291,9 +291,7 @@ public function leave()
                             AND userID = ?";
                 $statement = WCF::getDB()->prepare($sql);
                 $statement->execute([ 0, $room->roomID, $user->userID ]);
-                if ($statement->getAffectedRows() === 0) {
-                    throw new \LogicException('Unreachable');
-                }
+                \assert($statement->getAffectedRows() > 0);
 
                 WCF::getDB()->commitTransaction();
                 $commited = true;
diff --git a/files/lib/system/attachment/MessageAttachmentObjectType.class.php b/files/lib/system/attachment/MessageAttachmentObjectType.class.php
index 99212d4..dcc2ec8 100644
--- a/files/lib/system/attachment/MessageAttachmentObjectType.class.php
+++ b/files/lib/system/attachment/MessageAttachmentObjectType.class.php
@@ -35,9 +35,7 @@ public function canDownload($objectID)
         if ($objectID) {
             $message = new Message($objectID);
 
-            if ($message->getMessageType()->objectType !== 'be.bastelstu.chat.messageType.attachment') {
-                throw new \LogicException('Unreachable');
-            }
+            \assert($message->getMessageType()->objectType === 'be.bastelstu.chat.messageType.attachment');
             $room = $message->getRoom();
 
             return $room->canSee();
diff --git a/files/lib/system/event/listener/RoomCanJoinBanListener.class.php b/files/lib/system/event/listener/RoomCanJoinBanListener.class.php
index 10de3aa..0ea920d 100644
--- a/files/lib/system/event/listener/RoomCanJoinBanListener.class.php
+++ b/files/lib/system/event/listener/RoomCanJoinBanListener.class.php
@@ -35,9 +35,7 @@ public function execute($eventObj, $className, $eventName, array &$parameters)
             'be.bastelstu.chat.suspension',
             'be.bastelstu.chat.suspension.ban'
         );
-        if (!$objectTypeID) {
-            throw new \LogicException('Unreachable');
-        }
+        \assert($objectTypeID !== null);
 
         $suspensions = Suspension::getActiveSuspensionsByTriple(
             $objectTypeID,
diff --git a/files/lib/system/event/listener/RoomCanWritePubliclyMuteListener.class.php b/files/lib/system/event/listener/RoomCanWritePubliclyMuteListener.class.php
index 1d2f491..104ea2a 100644
--- a/files/lib/system/event/listener/RoomCanWritePubliclyMuteListener.class.php
+++ b/files/lib/system/event/listener/RoomCanWritePubliclyMuteListener.class.php
@@ -35,9 +35,7 @@ public function execute($eventObj, $className, $eventName, array &$parameters)
             'be.bastelstu.chat.suspension',
             'be.bastelstu.chat.suspension.mute'
         );
-        if (!$objectTypeID) {
-            throw new \LogicException('Unreachable');
-        }
+        \assert($objectTypeID !== null);
 
         $suspensions = Suspension::getActiveSuspensionsByTriple(
             $objectTypeID,