diff --git a/appinfo/info.xml b/appinfo/info.xml
index 0a437ecb3..94a504367 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -10,7 +10,7 @@ Folders can be configured from *Group folders* in the admin settings.
 After a folder is created, the admin can give access to the folder to one or more groups, control their write/sharing permissions and assign a quota for the folder.
 
 Note: Encrypting the contents of group folders is currently not supported.]]></description>
-	<version>17.0.8</version>
+	<version>17.0.9</version>
 	<licence>agpl</licence>
 	<author>Robin Appelman</author>
 	<namespace>GroupFolders</namespace>
diff --git a/lib/Migration/Version19000Date20241029123147.php b/lib/Migration/Version19000Date20241029123147.php
new file mode 100644
index 000000000..00348cea0
--- /dev/null
+++ b/lib/Migration/Version19000Date20241029123147.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\GroupFolders\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version19000Date20241029123147 extends SimpleMigrationStep {
+	/**
+	 * @param Closure(): ISchemaWrapper $schemaClosure
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if ($schema->hasTable('group_folders')) {
+			$table = $schema->getTable('group_folders');
+			if (!$table->hasIndex('gf_folders_folder_id')) {
+				$table->addUniqueIndex(['folder_id'], 'gf_folders_folder_id');
+				return $schema;
+			}
+		}
+
+		return null;
+	}
+}