this fixes the error

lib/travis/api/serialize/v1/http/build.rb

@@ -17,8 +17,6 @@ module Travis
             end
 
             def data
-              puts "***DEBUG1:*** #{build.matrix.first.inspect}"
-              puts "***DEBUG2:*** #{Job.new(build.matrix.first).inspect}"
               {
                 'id' => build.id,
                 'repository_id' => build.repository_id,

lib/travis/model/job.rb

@@ -174,7 +174,7 @@ class Job < Travis::Model
     end
 
     def normalize_config(config)
-      puts "**DEBUG:*** #{config.inspect}"
+      config = YAML.load(config) if config.is_a? String
       config = config ? config.deep_symbolize_keys : {}
 
       if config[:deploy]