diff --git a/src/c3nav/mapdata/render/renderer.py b/src/c3nav/mapdata/render/renderer.py
index c438f69d..503d23d8 100644
--- a/src/c3nav/mapdata/render/renderer.py
+++ b/src/c3nav/mapdata/render/renderer.py
@@ -20,7 +20,7 @@ class MapRenderer:
         self.scale = scale
         self.access_permissions = set(access_permissions) if access_permissions else set()
         self.full_levels = full_levels
-        self.min_width = min_width/self.scale
+        self.min_width = min_width/self.scale if min_width else None
 
         self.width = int(round((maxx - minx) * scale))
         self.height = int(round((maxy - miny) * scale))