diff -up ./runtime/stream.c.fix ./runtime/stream.c

--- ./runtime/stream.c.fix	2018-06-25 17:39:39.223082288 +0200

+++ ./runtime/stream.c	2018-06-25 17:40:26.549846798 +0200

@@ -1427,10 +1427,8 @@ asyncWriterThread(void *pPtr)

 			}

 			if(bTimedOut && pThis->iBufPtr > 0) {

 				/* if we timed out, we need to flush pending data */

-				d_pthread_mutex_unlock(&pThis->mut);

 				strmFlushInternal(pThis, 1);

 				bTimedOut = 0;

-				d_pthread_mutex_lock(&pThis->mut); 

 				continue;

 			}

 			bTimedOut = 0;