TypeError: Cannot read property 'length' of undefined
   at /jalan_pemalang/maps_pemalang_2.js:138:23
   at Layer.handle [as handle_request] (/jalan_pemalang/node_modules/express/lib/router/layer.js:95:5)
   at next (/jalan_pemalang/node_modules/express/lib/router/route.js:137:13)
   at Route.dispatch (/jalan_pemalang/node_modules/express/lib/router/route.js:112:3)
   at Layer.handle [as handle_request] (/jalan_pemalang/node_modules/express/lib/router/layer.js:95:5)
   at /jalan_pemalang/node_modules/express/lib/router/index.js:281:22
   at Function.process_params (/jalan_pemalang/node_modules/express/lib/router/index.js:335:12)
   at next (/jalan_pemalang/node_modules/express/lib/router/index.js:275:10)
   at Layer.handle [as handle_request] (/jalan_pemalang/node_modules/express/lib/router/layer.js:91:12)
   at trim_prefix (/jalan_pemalang/node_modules/express/lib/router/index.js:317:13)
   at /jalan_pemalang/node_modules/express/lib/router/index.js:284:7
   at Function.process_params (/jalan_pemalang/node_modules/express/lib/router/index.js:335:12)
   at next (/jalan_pemalang/node_modules/express/lib/router/index.js:275:10)
   at /jalan_pemalang/node_modules/connect-flash/lib/flash.js:21:5
   at Layer.handle [as handle_request] (/jalan_pemalang/node_modules/express/lib/router/layer.js:95:5)
   at trim_prefix (/jalan_pemalang/node_modules/express/lib/router/index.js:317:13)