From a0e37f250edf86b68ff0e26380883e9a3bf88434 Mon Sep 17 00:00:00 2001
From: Ivan Smirnov <i.s.smirnov@gmail.com>
Date: Sun, 26 Jun 2016 16:34:39 +0100
Subject: [PATCH] npy_format_descriptor::format() - fail if unbound

---
 include/pybind11/numpy.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/pybind11/numpy.h b/include/pybind11/numpy.h
index f9408526..73cdce0e 100644
--- a/include/pybind11/numpy.h
+++ b/include/pybind11/numpy.h
@@ -234,6 +234,8 @@ template <typename T> struct npy_format_descriptor
     }
 
     static const char* format() {
+        if (!dtype_())
+            pybind11_fail("NumPy: unsupported buffer format!");
         return format_();
     }