diff --git a/lib/pact/mock_service/request_handlers/interaction_replay.rb b/lib/pact/mock_service/request_handlers/interaction_replay.rb
index 09986ab..0e201d3 100644
--- a/lib/pact/mock_service/request_handlers/interaction_replay.rb
+++ b/lib/pact/mock_service/request_handlers/interaction_replay.rb
@@ -13,7 +13,11 @@ module RequestHandlers
       module PrettyGenerate
         #Doesn't seem to reliably pretty generate unless we go to JSON and back again :(
         def pretty_generate object
-          JSON.pretty_generate(JSON.parse(object.to_json))
+          begin
+            JSON.pretty_generate(JSON.parse(object.to_json))
+          rescue
+            object.to_s
+          end
         end
       end
 
diff --git a/spec/lib/pact/mock_service/request_handlers/interaction_replay_spec.rb b/spec/lib/pact/mock_service/request_handlers/interaction_replay_spec.rb
index 3bb5677..dbd116e 100644
--- a/spec/lib/pact/mock_service/request_handlers/interaction_replay_spec.rb
+++ b/spec/lib/pact/mock_service/request_handlers/interaction_replay_spec.rb
@@ -143,6 +143,18 @@ module RequestHandlers
               end
             end
           end
+          
+          context "when the body contains special charachters" do
+            let(:actual_body) { '\xEB' }
+            
+            let(:expected_response_body) do
+              {"message"=>"No interaction found for GET /path", "interaction_diffs"=>[{"body"=>{"ACTUAL"=>"\\xEB", "EXPECTED"=>{"a"=>"body"}}, "description"=>"a request"}]}
+            end
+            
+            it "returns the specified response status" do
+              expect(response_status).to eq 500
+            end
+          end
         end
 
         context "when no request is found with a matching method and path" do