Add CHANGELOG entry

CHANGELOG.md

@@ -12,6 +12,7 @@
 - [#3106](https://github.com/poanetwork/blockscout/pull/3106), [#3115](https://github.com/poanetwork/blockscout/pull/3115) - Fix verification of contracts, created from factory (from internal transaction)
 
 ### Chore
+- [#3124](https://github.com/poanetwork/blockscout/pull/3124) - Display upper border for tx speed if the value cannot be calculated
 
 
 ## 3.1.2-beta

apps/block_scout_web/lib/block_scout_web/views/transaction_view.ex

@@ -143,7 +143,7 @@ defmodule BlockScoutWeb.TransactionView do
     :pending
   end
 
-  def processing_time_duration(%Transaction{earliest_processing_start: nil} = tx) do
+  def processing_time_duration(%Transaction{earliest_processing_start: nil}) do
     avg_time = Timex.Duration.to_seconds(Explorer.Counters.AverageBlockTime.average_block_time())
     {:ok, "<= #{avg_time} seconds"}
   end