How to find which promises are unhandled in Node.js UnhandledPromiseRejectionWarning?

Node.js from version 7 has async/await syntactic sugar for handling promises and now in my code the following warning comes up quite often:

(node:11057) UnhandledPromiseRejectionWarning: Unhandled promise 
rejection (rejection id: 1): ReferenceError: Error: Can't set headers 
after they are sent.
(node:11057) 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.

Unfortunately there’s no reference to the line where the catch is missing.
Is there any way to find it without checking every try/catch block?

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