diff --git a/ledger/sandbox/src/main/scala/com/digitalasset/platform/index/JdbcIndexer.scala b/ledger/sandbox/src/main/scala/com/digitalasset/platform/index/JdbcIndexer.scala
index 8d537ecb1774..2b3a4aff0db9 100644
--- a/ledger/sandbox/src/main/scala/com/digitalasset/platform/index/JdbcIndexer.scala
+++ b/ledger/sandbox/src/main/scala/com/digitalasset/platform/index/JdbcIndexer.scala
@@ -257,6 +257,9 @@ class JdbcIndexer private[index] (
         // TODO(JM) implement configuration rejections
         Future.successful(())
 
+      case CommandRejected(submitterInfo, RejectionReason.DuplicateCommand) =>
+        Future.successful(())
+
       case CommandRejected(submitterInfo, reason) =>
         val rejection = PersistenceEntry.Rejection(
           LedgerEntry.Rejection(