diff --git a/lib/spitfire.ex b/lib/spitfire.ex
index 8c8942e..118a7d6 100644
--- a/lib/spitfire.ex
+++ b/lib/spitfire.ex
@@ -3804,6 +3804,10 @@ defmodule Spitfire do
     :eof
   end
 
+  defp peek_token(%{peek_token: nil}) do
+    :eof
+  end
+
   defp peek_token(%{tokens: :eot}) do
     :eof
   end
diff --git a/test/spitfire_test.exs b/test/spitfire_test.exs
index a0b921d..cb6f749 100644
--- a/test/spitfire_test.exs
+++ b/test/spitfire_test.exs
@@ -2439,6 +2439,11 @@ defmodule SpitfireTest do
                     ], [1]},
                    :ok
                  ]}, [{[line: 1, column: 1], "missing closing brace for tuple"}]}
+
+      code = "fn x -> %{a: {1,"
+
+      assert {:error, _ast, errors} = Spitfire.parse(code)
+      assert {[line: 1, column: 14], "missing closing brace for tuple"} in errors
     end
 
     test "missing closing map brace" do