diff --git a/lib/Permission.php b/lib/Permission.php
index b185b99..2570f04 100644
--- a/lib/Permission.php
+++ b/lib/Permission.php
@@ -55,10 +55,13 @@ class Permission {
 	}
 
 	public function isAllowedToCreateRoom(string $uid): bool {
-		$numberOfCreatedRooms = count($this->roomService->findAll($uid, [], []));
 		$restriction = $this->getRestriction($uid);
+		if ($restriction->getMaxRooms() < 0) {
+			return true;
+		}
+		$numberOfCreatedRooms = count($this->roomService->findByUserId($uid));
 
-		return $restriction->getMaxRooms() < 0 || $restriction->getMaxRooms() > $numberOfCreatedRooms;
+		return $restriction->getMaxRooms() > $numberOfCreatedRooms;
 	}
 
 	public function isUser(Room $room, ?string $uid): bool {
diff --git a/tests/Unit/PermissionTest.php b/tests/Unit/PermissionTest.php
index 09129c5..104c9e9 100644
--- a/tests/Unit/PermissionTest.php
+++ b/tests/Unit/PermissionTest.php
@@ -83,7 +83,8 @@ class PermissionTest extends TestCase {
 
 		$this->roomService
 			->expects($this->once())
-			->method('findAll')
+			->method('findByUserId')
+			->with('foobar')
 			->willReturn([
 				$this->createRoom(1, 'foo'),
 				$this->createRoom(2, 'bar'),
diff --git a/ts/Manager/App.tsx b/ts/Manager/App.tsx
index 2a6dbc4..aec8ac0 100644
--- a/ts/Manager/App.tsx
+++ b/ts/Manager/App.tsx
@@ -146,7 +146,8 @@ const App: React.FC<Props> = () => {
 	}
 
 	const maxRooms = restriction?.maxRooms || 0;
-	const quota = maxRooms < 0 ? t('bbb', 'unlimited') : rooms.filter(room => room.userId === OC.currentUser).length + ' / ' + maxRooms;
+	const ownRoomsLength = rooms.filter(room => room.userId === OC.currentUser).length;
+	const quota = maxRooms < 0 ? t('bbb', 'unlimited') : ownRoomsLength + ' / ' + maxRooms;
 
 	return (
 		<div id="bbb-react-root"
@@ -188,7 +189,7 @@ const App: React.FC<Props> = () => {
 							{!isLoaded && <span className="icon icon-loading-small icon-visible"></span>}
 						</td>
 						<td>
-							{(maxRooms > rows.length || maxRooms < 0) ?
+							{(maxRooms > ownRoomsLength || maxRooms < 0) ?
 								<NewRoomForm addRoom={addRoom} /> :
 								<p className="text-muted">{maxRooms === 0 ?
 									t('bbb', 'You are not permitted to create a room.') :