diff --git a/lib/Provider/TextContextProvider.php b/lib/Provider/TextContextProvider.php
index 089cdacb3..2fe3707c6 100644
--- a/lib/Provider/TextContextProvider.php
+++ b/lib/Provider/TextContextProvider.php
@@ -66,9 +66,8 @@ public function buildDocument(): Document {
 
 	#[\Override]
 	public function prepareSession(): SessionInfo {
-		$readonly = !$this->permissionService->checkPermission($this->cardMapper, $this->cardId, Acl::PERMISSION_EDIT, $this->userId);
 		return new SessionInfo(
-			readOnly: $readonly,
+			readOnly: $this->isReadOnly(),
 			lock: null,
 			canAttachFiles: false,
 		);
@@ -76,7 +75,11 @@ public function prepareSession(): SessionInfo {
 
 	#[\Override]
 	public function isReadOnly(): bool {
-		return !$this->permissionService->checkPermission($this->cardMapper, $this->cardId, Acl::PERMISSION_EDIT, $this->userId);
+		try {
+			return !$this->permissionService->checkPermission($this->cardMapper, $this->cardId, Acl::PERMISSION_EDIT, $this->userId);
+		} catch (NoPermissionException|DoesNotExistException) {
+			return true;
+		}
 	}
 
 	#[\Override]
diff --git a/tests/unit/Provider/TextContextProviderTest.php b/tests/unit/Provider/TextContextProviderTest.php
index 72f0408fd..a73d62a0d 100644
--- a/tests/unit/Provider/TextContextProviderTest.php
+++ b/tests/unit/Provider/TextContextProviderTest.php
@@ -8,6 +8,7 @@
 namespace OCA\Deck\Provider;
 
 use OC\Security\SecureRandom;
+use OCA\Deck\Db\Acl;
 use OCA\Deck\Db\Card;
 use OCA\Deck\Db\CardMapper;
 use OCA\Deck\NoPermissionException;
@@ -22,6 +23,7 @@
 
 class TextContextProviderTest extends TestCase {
 	private CardService&MockObject $cardService;
+	private PermissionService&MockObject $permissionService;
 	private TextContextProvider $provider;
 
 	protected function setUp(): void {
@@ -30,11 +32,12 @@ protected function setUp(): void {
 			$this->markTestSkipped('Text app not available');
 		}
 		$this->cardService = $this->createMock(CardService::class);
+		$this->permissionService = $this->createMock(PermissionService::class);
 		$this->provider = new TextContextProvider(
 			$this->createMock(SecureRandom::class),
 			$this->cardService,
 			$this->createMock(CardMapper::class),
-			$this->createMock(PermissionService::class),
+			$this->permissionService,
 			'admin',
 			5,
 		);
@@ -75,4 +78,24 @@ public function testBuildDocumentNoPermission(): void {
 		$this->expectException(NotPermittedException::class);
 		$this->provider->buildDocument();
 	}
+
+	public function testPrepareSessionWithEditPermission(): void {
+		$this->permissionService->expects($this->once())
+			->method('checkPermission')
+			->with($this->anything(), 5, Acl::PERMISSION_EDIT, 'admin')
+			->willReturn(true);
+
+		$sessionInfo = $this->provider->prepareSession();
+
+		$this->assertFalse($sessionInfo->readOnly);
+		$this->assertFalse($sessionInfo->canAttachFiles);
+		$this->assertNull($sessionInfo->lock);
+	}
+
+	public function testPrepareSessionWithoutEditPermission(): void {
+		$this->permissionService->method('checkPermission')
+			->willThrowException(new NoPermissionException('denied'));
+
+		$this->assertTrue($this->provider->prepareSession()->readOnly);
+	}
 }