err:file:GetOverlappedResult lpOverlapped->hEvent was null

[Scott W Gifford]

When running an application under Wine that uses the serial port, I
get messages like this over and over:

err:file:GetOverlappedResult lpOverlapped->hEvent was null

However, the API documentation implies that this is perfectly fine:

OVERLAPPED
...
  hEvent

Handle to an event set to the signaled state when the operation
    has been completed. The calling process must set this member
    either to zero or a valid event handle before calling any
    overlapped functions. To create an event object, use the
    CreateEvent function.

Despite this error message, the application appears to work normally.

Is there some reason for this error, or can I safely remove the
message?

----ScottG.