js heap out of memory

[hamidzr]

when rendering the csta18 page?

TypeError: req.redirect is not a function
    at app.get (/home/ubuntu/netsblox.org/src/server/index.js:84:52)
    at Layer.handle [as handle_request] (/home/ubuntu/netsblox.org/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/ubuntu/netsblox.org/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/home/ubuntu/netsblox.org/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/home/ubuntu/netsblox.org/node_modules/express/lib/router/layer.js:95:5)
    at /home/ubuntu/netsblox.org/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/home/ubuntu/netsblox.org/node_modules/express/lib/router/index.js:335:12)
    at next (/home/ubuntu/netsblox.org/node_modules/express/lib/router/index.js:275:10)
    at urlencodedParser (/home/ubuntu/netsblox.org/node_modules/body-parser/lib/types/urlencoded.js:91:7)
    at Layer.handle [as handle_request] (/home/ubuntu/netsblox.org/node_modules/express/lib/router/layer.js:95:5)
FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
 1: node::Abort() [node /home/ubuntu/netsblox.org/src/server/index.js]
 2: 0x109608c [node /home/ubuntu/netsblox.org/src/server/index.js]
 3: v8::Utils::ReportApiFailure(char const*, char const*) [node /home/ubuntu/netsblox.org/src/server/index.js]
 4: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [node /home/ubuntu/netsblox.org/src/server/index.js]
 5: v8::internal::Factory::NewRawOneByteString(int, v8::internal::PretenureFlag) [node /home/ubuntu/netsblox.org/src/server/index.js]
 6: v8::internal::JsonParser<true>::ParseJsonValue() [node /home/ubuntu/netsblox.org/src/server/index.js]
 7: v8::internal::JsonParser<true>::ParseJsonObject() [node /home/ubuntu/netsblox.org/src/server/index.js]
 8: v8::internal::JsonParser<true>::ParseJsonValue() [node /home/ubuntu/netsblox.org/src/server/index.js]
 9: v8::internal::JsonParser<true>::ParseJsonArray() [node /home/ubuntu/netsblox.org/src/server/index.js]
10: v8::internal::JsonParser<true>::ParseJsonValue() [node /home/ubuntu/netsblox.org/src/server/index.js]
11: v8::internal::JsonParser<true>::ParseJson() [node /home/ubuntu/netsblox.org/src/server/index.js]
12: v8::internal::JsonParser<true>::Parse(v8::internal::Handle<v8::internal::String>) [node /home/ubuntu/netsblox.org/src/server/index.js]
13: v8::internal::Runtime_ParseJson(int, v8::internal::Object**, v8::internal::Isolate*) [node /home/ubuntu/netsblox.org/src/server/index.js]
14: 0xfa7238092a7