From ed2c4ec56ad677b92a40049030a40a5e71df4063 Mon Sep 17 00:00:00 2001
From: Enno Rehling <enno@kn-bremen.de>
Date: Thu, 1 Sep 2016 21:57:50 +0200
Subject: [PATCH] missing null-check before isparam

---
 src/kernel/build.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/kernel/build.c b/src/kernel/build.c
index a6e8ff3dc..6bea3e6b4 100644
--- a/src/kernel/build.c
+++ b/src/kernel/build.c
@@ -175,7 +175,7 @@ int destroy_cmd(unit * u, struct order *ord)
         }
     }
 
-    if (isparam(s, u->faction->locale, P_ROAD)) {
+    if (s && isparam(s, u->faction->locale, P_ROAD)) {
         destroy_road(u, n, ord);
         return 0;
     }