When I try to create an account with a post request

[jamesylgan]

(node:8840) UnhandledPromiseRejectionWarning
(node:8840) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:8840) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

[dlkconsultancy]

To create the accounts, execute a POST request to http://localhost:4000/.

We created the first request and wallet is created successfully but we try to post another request after first one, it crashed. No response return localhost:4000. ?