If save the log as a file, a disk failure will cause the node to crash.

[liujun-dlink]

If save the log as a file, a disk failure will cause the node to crash. It is recommended that add an exception capture when write to log file.

[lamweili]

The appenders cause the Node.js process to exit as there was no listener for its 'error' event.
Fixed in #529, #1089, #1097 of log4js@6.4.0 by adding an 'error' listener to EventEmitter.

If an EventEmitter does not have at least one listener registered for the 'error' event, and an 'error' event is emitted, the error is thrown, a stack trace is printed, and the Node.js process exits.
(src: https://nodejs.org/docs/latest/api/events.html#error-events)