Transaction actions fix (blockscout#6832)

* Fix tx actions handler * Small change for mix credo * Update changelog --------- Co-authored-by: POA <33550681+poa@users.noreply.github.com> (cherry picked from commit c2497c7)
FunctionX · Feb 14, 2023 · 9e5d548 · 9e5d548
1 parent d0499b6
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -14,6 +14,7 @@
 ### Fixes
 
 - [#6831](https://github.com/blockscout/blockscout/pull/6831) - Copy of [#6028](https://github.com/blockscout/blockscout/pull/6028)
+- [#6832](https://github.com/blockscout/blockscout/pull/6832) - Transaction actions fix
 - [#6827](https://github.com/blockscout/blockscout/pull/6827) - Fix handling unknown calls from `callTracer`
 - [#6793](https://github.com/blockscout/blockscout/pull/6793) - Change sig-provider default image tag to main
 - [#6777](https://github.com/blockscout/blockscout/pull/6777) - Fix -1 transaction counter

diff --git a/apps/indexer/lib/indexer/transform/transaction_actions.ex b/apps/indexer/lib/indexer/transform/transaction_actions.ex
@@ -164,7 +164,12 @@ defmodule Indexer.Transform.TransactionActions do
   defp uniswap_filter_logs(logs) do
     logs
     |> Enum.filter(fn log ->
-      first_topic = String.downcase(log.first_topic)
+      first_topic =
+        if is_nil(log.first_topic) do
+          ""
+        else
+          String.downcase(log.first_topic)
+        end
 
       Enum.member?(
         [