diff --git a/lib/nexpose/site.rb b/lib/nexpose/site.rb
index 5c039518..d889b2de 100644
--- a/lib/nexpose/site.rb
+++ b/lib/nexpose/site.rb
@@ -739,6 +739,8 @@ def include?(subset)
       else
         true
       end
+    rescue IPAddr::InvalidAddressError
+      false
     end
 
     def hash