diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/log.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/log.ex
index 55b327ee0e..c9a6fd08e6 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/log.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/log.ex
@@ -171,7 +171,11 @@ defmodule EthereumJSONRPC.Log do
     do: entry
 
   defp entry_to_elixir({key, quantity}) when key in ~w(blockNumber logIndex transactionIndex transactionLogIndex) do
-    {key, quantity_to_integer(quantity)}
+    if is_nil(quantity) do
+      {key, nil}
+    else
+      {key, quantity_to_integer(quantity)}
+    end
   end
 
   defp put_topics(params, topics) when is_map(params) and is_list(topics) do
diff --git a/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/log_test.exs b/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/log_test.exs
index a2c43064cf..3237ea8303 100644
--- a/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/log_test.exs
+++ b/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/log_test.exs
@@ -2,4 +2,31 @@ defmodule EthereumJSONRPC.LogTest do
   use ExUnit.Case, async: true
 
   doctest EthereumJSONRPC.Log
+
+  alias EthereumJSONRPC.Log
+
+  describe "to_elixir/1" do
+    test "does not tries convert nils to integer" do
+      input = %{
+        "address" => "0xda8b3276cde6d768a44b9dac659faa339a41ac55",
+        "blockHash" => nil,
+        "blockNumber" => nil,
+        "data" => "0x290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e563",
+        "logIndex" => "0x0",
+        "removed" => false,
+        "topics" => [
+          "0xadc1e8a294f8415511303acc4a8c0c5906c7eb0bf2a71043d7f4b03b46a39130",
+          "0x000000000000000000000000c15bf627accd3b054075c7880425f903106be72a",
+          "0x000000000000000000000000a59eb37750f9c8f2e11aac6700e62ef89187e4ed"
+        ],
+        "transactionHash" => "0xf9b663b4e9b1fdc94eb27b5cfba04eb03d2f7b3fa0b24eb2e1af34f823f2b89e",
+        "transactionIndex" => "0x0"
+      }
+
+      result = Log.to_elixir(input)
+
+      assert result["blockNumber"] == nil
+      assert result["blockHash"] == nil
+    end
+  end
 end