From 6db1b0abd869c091a889c5342203599a3291d3eb Mon Sep 17 00:00:00 2001
From: Danny Weinberg <danny.weinberg@discordapp.com>
Date: Sun, 3 Feb 2019 10:52:09 -0800
Subject: [PATCH] Handle regex not finding anything

---
 Library/Homebrew/utils/curl.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/utils/curl.rb b/Library/Homebrew/utils/curl.rb
index bcc47d4394..d66fec1dcb 100644
--- a/Library/Homebrew/utils/curl.rb
+++ b/Library/Homebrew/utils/curl.rb
@@ -60,7 +60,7 @@ def curl_download(*args, to: nil, **options)
   supports_partial_download = http_status.to_i == 206 # Partial Content
   if supports_partial_download &&
      destination.exist? &&
-     destination.size == %r{^.*Content-Range: bytes \d+-\d+/(\d+)\r\n.*$}m.match(headers)[1].to_i
+     destination.size == %r{^.*Content-Range: bytes \d+-\d+/(\d+)\r\n.*$}m.match(headers)&.[](1)&.to_i
     return # We've already downloaded all the bytes
   end