1 files changed, 1 insertions, 1 deletions
diff --git a/lib/private/DB/MigrationService.php b/lib/private/DB/MigrationService.php
index e7361cb4cab..0cf37cb995a 100644
--- a/lib/private/DB/MigrationService.php
+++ b/lib/private/DB/MigrationService.php
@@ -634,7 +634,7 @@ class MigrationService {
 				if ($isUsingDefaultName && \strlen($table->getName()) - $prefixLength >= 23) {
 					throw new \InvalidArgumentException('Primary index name on "' . $table->getName() . '" is too long.');
 				}
-			} elseif (!$primaryKey instanceof Index) {
+			} elseif (!$primaryKey instanceof Index && !$sourceTable instanceof Table) {
 				throw new \InvalidArgumentException('Table "' . $table->getName() . '" has no primary key and therefor will not behave sane in clustered setups.');
 			}
 		}