Merge pull request #5184 from blockscout/vb-eth-call-nill-from-fix

eth_call method: remove from param from the request, if it is null

CHANGELOG.md

@@ -5,6 +5,7 @@
 - [#4690](https://github.com/blockscout/blockscout/pull/4690) - Improve pagination: introduce pagination with random access to pages; Integrate it to the Transactions List page
 
 ### Fixes
+- [#5184](https://github.com/blockscout/blockscout/pull/5184) - eth_call method: remove from param from the request, if it is null
 - [#5172](https://github.com/blockscout/blockscout/pull/5172), [#5182](https://github.com/blockscout/blockscout/pull/5182) - Reduced the size of js bundles
 - [#5160](https://github.com/blockscout/blockscout/pull/5160) - Fix blocks validated hint
 - [#5155](https://github.com/blockscout/blockscout/pull/5155) - Fix get_implementation_abi_from_proxy/2 implementation

apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex

@@ -188,10 +188,14 @@ defmodule EthereumJSONRPC.Contract do
         block_number -> integer_to_quantity(block_number)
       end
 
+    params =
+      %{to: contract_address, data: data}
+      |> (&if(is_nil(from), do: &1, else: Map.put(&1, :from, from))).()
+
     full_params = %{
       id: id,
       method: "eth_call",
-      params: [%{to: contract_address, data: data, from: from}, block]
+      params: [params, block]
     }
 
     request(full_params)