From 77581437f7a28fbfbc131d9529011be2b20a626b Mon Sep 17 00:00:00 2001
From: Josh Peak <neozenith.dev@gmail.com>
Date: Tue, 2 Jul 2019 13:53:36 +1000
Subject: [PATCH] fix IndexError when empty cassette throws
 CannotOverwriteCassetteException

---
 vcr/cassette.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vcr/cassette.py b/vcr/cassette.py
index 70ed20e..bbed20e 100644
--- a/vcr/cassette.py
+++ b/vcr/cassette.py
@@ -311,7 +311,7 @@ class Cassette(object):
         best_matches.sort(key=lambda t: t[0], reverse=True)
         # Get the first best matches (multiple if equal matches)
         final_best_matches = []
-        previous_nb_success = best_matches[0][0]
+        previous_nb_success = 0 
         for best_match in best_matches:
             nb_success = best_match[0]
             # Do not keep matches that have 0 successes,