From 08d947226df768bfe90736674fc2f34af16bd5cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Laura=20Kl=C3=BCnder?= <laura@codingcatgirl.de>
Date: Fri, 22 Dec 2017 15:30:04 +0100
Subject: [PATCH] fix error for areas with no nodes

---
 src/c3nav/routing/router.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/c3nav/routing/router.py b/src/c3nav/routing/router.py
index d73cc7e5..f7515def 100644
--- a/src/c3nav/routing/router.py
+++ b/src/c3nav/routing/router.py
@@ -220,9 +220,10 @@ class Router:
             if edge.access_restriction:
                 restrictions.setdefault(edge.access_restriction, RouterRestriction()).edges.append(index)
 
+        # respect slow_down_factor
         for area in areas.values():
             if area.slow_down_factor != 1:
-                area_nodes = np.array(area.nodes)
+                area_nodes = np.array(area.nodes, dtype=np.uint32)
                 graph[area_nodes.reshape((-1, 1)), area_nodes] *= float(area.slow_down_factor)
 
         # finalize waytype matrixes