Error: self signed certificate with gmail

[ghost]

host is imap.gmail.com, port 993, tls true; this worked a year ago but now it logs these errors

Error [ERR_STREAM_DESTROYED]: Cannot call write after a stream was destroyed
    at doWrite (_stream_writable.js:414:19)
    at clearBuffer (_stream_writable.js:544:7)
    at Socket.Writable.uncork (_stream_writable.js:322:7)
    at JSStreamSocket.doWrite (internal/js_stream_socket.js:162:17)
    at JSStream.onwrite (internal/js_stream_socket.js:20:57)
    at Socket.ondata (internal/js_stream_socket.js:64:22)
    at Socket.emit (events.js:203:13)
    at addChunk (_stream_readable.js:295:12)
    at readableAddChunk (_stream_readable.js:276:11)
    at Socket.Readable.push (_stream_readable.js:210:10) {
  source: 'socket'
} IMAP_ERROR undefined
Error: self signed certificate
    at TLSSocket.onConnectSecure (_tls_wrap.js:1317:34)
    at TLSSocket.emit (events.js:203:13)
    at TLSSocket._finishInit (_tls_wrap.js:792:8)
    at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:606:12)
    at Socket.ondata (internal/js_stream_socket.js:64:22)
    at Socket.emit (events.js:203:13)
    at addChunk (_stream_readable.js:295:12)
    at readableAddChunk (_stream_readable.js:276:11)
    at Socket.Readable.push (_stream_readable.js:210:10)
    at TCP.onStreamRead (internal/stream_base_commons.js:166:17) {
  code: 'DEPTH_ZERO_SELF_SIGNED_CERT',
  source: 'socket'
} IMAP_ERROR undefined