diff --git a/.dialyzer-ignore b/.dialyzer-ignore
index d45a57f55c..7f7f8757a4 100644
--- a/.dialyzer-ignore
+++ b/.dialyzer-ignore
@@ -18,7 +18,7 @@ lib/phoenix/router.ex:402
 lib/block_scout_web/views/layout_view.ex:145: The call 'Elixir.Poison.Parser':'parse!'
 lib/block_scout_web/views/layout_view.ex:237: The call 'Elixir.Poison.Parser':'parse!'
 lib/block_scout_web/controllers/api/rpc/transaction_controller.ex:22
-lib/explorer/smart_contract/reader.ex:435
+lib/explorer/smart_contract/reader.ex:436
 lib/indexer/fetcher/token_total_supply_on_demand.ex:16
 lib/explorer/exchange_rates/source.ex:110
 lib/explorer/exchange_rates/source.ex:113
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36efde3752..eec752ab24 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Features
 
 ### Fixes
+- [#5066](https://github.com/blockscout/blockscout/pull/5066) - Fix read contract page bug
 - [#5071](https://github.com/blockscout/blockscout/pull/5071) - Fix write page contract tuple input
 - [#5034](https://github.com/blockscout/blockscout/pull/5034) - Fix broken functions input at transation page
 - [#5025](https://github.com/blockscout/blockscout/pull/5025) - Add standard input JSON files validation
diff --git a/apps/explorer/lib/explorer/smart_contract/reader.ex b/apps/explorer/lib/explorer/smart_contract/reader.ex
index 466a4655ab..fd07294a00 100644
--- a/apps/explorer/lib/explorer/smart_contract/reader.ex
+++ b/apps/explorer/lib/explorer/smart_contract/reader.ex
@@ -298,13 +298,14 @@ defmodule Explorer.SmartContract.Reader do
   defp get_abi_with_method_id(abi) do
     abi
     |> Enum.map(fn method ->
-      parsed_method = [method] |> ABI.parse_specification() |> Enum.at(0)
-
-      if is_map(parsed_method) do
-        method_id = Map.get(parsed_method, :method_id)
+      with parsed_method <- [method] |> ABI.parse_specification() |> Enum.at(0),
+           true <- is_map(parsed_method),
+           method_id <- Map.get(parsed_method, :method_id),
+           true <- !is_nil(method_id) do
         Map.put(method, "method_id", Base.encode16(method_id, case: :lower))
       else
-        method
+        _ ->
+          method
       end
     end)
   end