From 7c902cfadff18e93d181d3b4c0e91b68316104f4 Mon Sep 17 00:00:00 2001
From: kballou <kballou@devnulllabs.io>
Date: Tue, 22 Mar 2016 15:16:51 -0600
Subject: Add guard to series function

This function will not work down the chain unless this parameter is a list,
this will make sure that it comes in as a list (or will match error)
---
 lib/ex_prometheus_io.ex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/ex_prometheus_io.ex b/lib/ex_prometheus_io.ex
index dd47bee..43604ea 100644
--- a/lib/ex_prometheus_io.ex
+++ b/lib/ex_prometheus_io.ex
@@ -15,7 +15,7 @@ defmodule ExPrometheusIo do
     spawn_query(:range, query_opts)
   end
 
-  def series(matches, _opts \\ []) do
+  def series(matches, _opts \\ []) when is_list(matches) do
     spawn_query(:series, [matches])
   end
 
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