Add method exists check to migration

Signed-off-by: Anna Larch <anna@nextcloud.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Migration/Version1100Date20210512142306.php b/lib/Migration/Version1100Date20210512142306.php
index 38d0de51c..453d07ced 100644
--- a/lib/Migration/Version1100Date20210512142306.php
+++ b/lib/Migration/Version1100Date20210512142306.php
@@ -31,6 +31,11 @@ class Version1100Date20210512142306 extends SimpleMigrationStep {
 	 * @param array $options
 	 */
 	public function postSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
+		if (!method_exists($this->mailboxMapper, 'findAllIds')) {
+			$output->warning('New Mail code hasn\'t been loaded yet, skipping tag migration. Please run `occ mail:tags:migration-jobs` after the upgrade.');
+			return;
+		}
+
 		foreach ($this->mailboxMapper->findAllIds() as $mailboxId) {
 			$this->jobList->add(MigrateImportantJob::class, ['mailboxId' => $mailboxId]);
 		}