diff --git a/apps/indexer/lib/indexer/fetcher/optimism/txn_batch.ex b/apps/indexer/lib/indexer/fetcher/optimism/txn_batch.ex
index c122d1713c..5f70a79f70 100644
--- a/apps/indexer/lib/indexer/fetcher/optimism/txn_batch.ex
+++ b/apps/indexer/lib/indexer/fetcher/optimism/txn_batch.ex
@@ -1265,7 +1265,15 @@ defmodule Indexer.Fetcher.Optimism.TxnBatch do
       |> Enum.uniq()
       |> Enum.filter(fn id -> id > 0 end)
 
-    Repo.delete_all(from(fs in FrameSequence, where: fs.id in ^ids))
+    try do
+      Repo.delete_all(from(fs in FrameSequence, where: fs.id in ^ids))
+    rescue
+      # we need to ignore `foreign_key_violation` exception when deleting the rows
+      # because there can be a case when the chain partially replaces the frame sequence
+      # (e.g. Unichain Private Testnet), and so some rows in `op_transaction_batches` table
+      # can still reference to the `op_frame_sequences` table
+      _ -> nil
+    end
   end
 
   defp set_frame_sequences_view_ready(sequences) do
diff --git a/cspell.json b/cspell.json
index 3fbe051f38..be5ffa2cca 100644
--- a/cspell.json
+++ b/cspell.json
@@ -564,6 +564,7 @@
         "unfetched",
         "unfinalized",
         "unindexed",
+        "Unichain",
         "Unitarion",
         "Unitorius",
         "Unitorus",