From aef7e7ef37656052932cc9a4c3cf5429d38ff862 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sat, 30 Nov 2019 15:05:58 +0100
Subject: [PATCH] fixed potential crash in get_umap

---
 nonisotropic.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nonisotropic.cpp b/nonisotropic.cpp
index 18b85c2c..7add7010 100644
--- a/nonisotropic.cpp
+++ b/nonisotropic.cpp
@@ -1115,7 +1115,7 @@ EX namespace hybrid {
       }
     }  
 
-  EX hrmap* get_umap() { return ((hrmap_hybrid*)currentmap)->underlying_map; }
+  EX hrmap* get_umap() { if(!dynamic_cast<hrmap_hybrid*>(currentmap)) return nullptr; else return ((hrmap_hybrid*)currentmap)->underlying_map; }
   
   #if HDR
   template<class T> auto in_underlying_geometry(const T& f) -> decltype(f()) {