Merge pull request #2736 from poanetwork/ab-fix-empty-block

do not update cache if no blocks were inserted

CHANGELOG.md

@@ -11,6 +11,7 @@
 - [#2663](https://github.com/poanetwork/blockscout/pull/2663) - Fetch address counters in parallel
 
 ### Fixes
+- [#2736](https://github.com/poanetwork/blockscout/pull/2736) - do not update cache if no blocks were inserted
 - [#2731](https://github.com/poanetwork/blockscout/pull/2731) - fix library verification
 - [#2718](https://github.com/poanetwork/blockscout/pull/2718) - Include all addresses taking part in transactions in wallets' addresses counter
 - [#2709](https://github.com/poanetwork/blockscout/pull/2709) - Fix stuck label and value for uncle block height

apps/indexer/lib/indexer/block/fetcher.ex

@@ -184,6 +184,8 @@ defmodule Indexer.Block.Fetcher do
     end
   end
 
+  defp update_block_cache([]), do: :ok
+
   defp update_block_cache(blocks) when is_list(blocks) do
     {min_block, max_block} = Enum.min_max_by(blocks, & &1.number)