lib/solve/solver/serializer.rb in solve-4.0.3 vs lib/solve/solver/serializer.rb in solve-4.0.4

@@ -1,5 +1,5 @@
-require "json"
+require "json" unless defined?(JSON)
 require_relative "../graph"
 
 module Solve
 
   Problem = Struct.new(:graph, :demands)