Modified span error reporting so that it will not log an error when a…

… connection is aborted.

lib/span.js

@@ -839,6 +839,18 @@ function isRealObject (v) {
 Span.prototype.error = function (error) {
   log.span(`span.error on ${this.name}`)
 
+  // when there is an aborted incoming request (e.g. user pressed stop in their browser)
+  // the error will be on top span and there will be no lastEvent.
+  // (note:there can also be an aborted connection on an outgoing request on a lower span)
+  // reporting error (via _internal method of span) without lastEvent will fail.
+  // that failure will create an error level log entry.
+  // logging an "error in reporting an error" is too much and leads to end user confusion.
+  // thus, log the issue at the span level and return gracefully.
+  if (this.topSpan && error && error.code === 'ECONNRESET') {
+    log.span('Connection reset', error)
+    return
+  }
+
   try {
     const orig = error
     error = Span.toError(error)