From e3512120403dc7863a38bf2f122e7523593718ad Mon Sep 17 00:00:00 2001
From: xzyfer <xzyfer@gmail.com>
Date: Mon, 16 Apr 2018 19:45:03 +1000
Subject: [PATCH] Fix segfault on empty custom properties

Originally reported in sass/sassc#225

Fixes sass/sassc#225
Spec sass/sass-spec#1249
---
 src/expand.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/expand.cpp b/src/expand.cpp
index ccd2822df..d8dc03f14 100644
--- a/src/expand.cpp
+++ b/src/expand.cpp
@@ -246,7 +246,8 @@ namespace Sass {
       std::string str(prop->to_string(ctx.c_options));
       new_p = SASS_MEMORY_NEW(String_Constant, old_p->pstate(), str);
     }
-    Expression_Obj value = d->value()->perform(&eval);
+    Expression_Obj value = d->value();
+    if (value) value = value->perform(&eval);
     Block_Obj bb = ab ? operator()(ab) : NULL;
     if (!bb) {
       if (!value || (value->is_invisible() && !d->is_important())) return 0;