diff --git a/zuendstoffe/scrape.rb b/zuendstoffe/scrape.rb
index 3475d53..39bbc19 100644
--- a/zuendstoffe/scrape.rb
+++ b/zuendstoffe/scrape.rb
@@ -115,7 +115,7 @@ end.collect do |node|
       s["title"],
       s["addressStreet"],
       "#{s["addressPostalCode"]} #{s["addressCity"]}",
-    ].collect { |s| s.strip }
+    ].collect { |s| s.to_s.strip }
       .filter { |s| s.to_s.size > 1 }
     m
   rescue