X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/7ec9537d581097b506417350de3063fca2a31003..d2c9ea6cf04b373f3c21b9b000cacf6c23cc30dd:/app/controllers/amf_controller.rb

diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb
index a2bb1b454..aaad3fe11 100644
--- a/app/controllers/amf_controller.rb
+++ b/app/controllers/amf_controller.rb
@@ -123,7 +123,7 @@ class AmfController < ApplicationController
     points = nodes_not_used_in_area.collect { |n| [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash] }
 
     # find the relations used by those nodes and ways
-    relation_ids = Relation.find_for_nodes_and_ways(nodes_in_area.collect {|n| n.id}, way_ids).collect {|n| n.id}.uniq
+    relation_ids = (Relation.find_for_nodes_and_ways(nodes_in_area.collect {|n| n.id}, way_ids)||[]).collect {|n| n.id}.uniq
 
     [way_ids,points,relation_ids]
   end