This condition is often normal, and the message is merely informational (as when piping many lines to the head(1) program). The condition occurs when a write on a pipe does not find a reading process. This usually generates a signal to the executing program, but this message displays when the program ignores the signal.
Check the process at the end of the pipe to see why it exited.
The symbolic name of this error is EPIPE, errno=32.