From 2e58957f9acb5a1c44bc91b827d440851cd5857e Mon Sep 17 00:00:00 2001
From: Guillaume Horel <guillaume.horel@gmail.com>
Date: Fri, 16 Aug 2019 13:21:04 -0400
Subject: prevent segfault

---
 pyisda/credit_index.pyx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pyisda/credit_index.pyx b/pyisda/credit_index.pyx
index b59e19c..31044b9 100644
--- a/pyisda/credit_index.pyx
+++ b/pyisda/credit_index.pyx
@@ -89,7 +89,9 @@ cdef class CurveList:
             for i in range(self._weights.size()):
                 self._weights[i] /= total_weight
 
-    def __getitem__(self, tuple name):
+    def __getitem__(self, tuple name not None):
+        if len(name) != 3:
+            raise TypeError("`name` needs to be a string, Seniority, DocClause triplet")
         cdef:
             string ticker_cpp = name[0]
             CurveName.Seniority seniority = <CurveName.Seniority>(<int>name[1])
-- 
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