Handle exited realtime fetcher

CHANGELOG.md

@@ -7,6 +7,7 @@
 
 ### Fixes
 - [#5416](https://github.com/blockscout/blockscout/pull/5416) - Fix getsourcecode for EOA addresses
+- [#5410](https://github.com/blockscout/blockscout/pull/5410) - Handle exited realtime fetcher
 - [#5383](https://github.com/blockscout/blockscout/pull/5383) - Fix reload transactions button
 - [#5381](https://github.com/blockscout/blockscout/pull/5381), [#5397](https://github.com/blockscout/blockscout/pull/5397) - Fix exchange rate broadcast error
 - [#5375](https://github.com/blockscout/blockscout/pull/5375) - Fix pending transactions fetcher

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

@@ -155,6 +155,14 @@ defmodule Indexer.Block.Realtime.Fetcher do
         Logger.debug(fn -> ["Could not connect to websocket: #{inspect(reason)}. Continuing with polling."] end)
         state
     end
+  catch
+    :exit, _reason ->
+      if Map.get(state, :timer) && state.timer do
+        Process.cancel_timer(state.timer)
+      end
+
+      timer = schedule_polling()
+      %{state | timer: timer}
   end
 
   defp subscribe_to_new_heads(state, _), do: state