UnhandledPromiseRejectionWarning leaving the server unresponsive

[ghost]

(node:10290) UnhandledPromiseRejectionWarning: Error: RegistryResolveFailed
at JolocomRegistry.resolve (/home/ec2-user/generic-backend/node_modules/jolocom-lib/js/registries/jolocomRegistry.js:96:19)
at process._tickCallback (internal/process/next_tick.js:68:7)
(node:10290) 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:10290) [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.

Issue is happening with all demo applications and generic backend as well, after submitting claims from wallet application.
this is the wallet application build I am using.