diff --git a/src/platforms/hosted/ftdi_bmp.c b/src/platforms/hosted/ftdi_bmp.c
index f78ab4c..7ff6485 100644
--- a/src/platforms/hosted/ftdi_bmp.c
+++ b/src/platforms/hosted/ftdi_bmp.c
@@ -455,6 +455,8 @@ bool libftdi_srst_get_val(void)
 
 void libftdi_buffer_flush(void)
 {
+	if (!bufptr)
+		return;
 	DEBUG_WIRE("Flush\n");
 #if defined(USE_USB_VERSION_BIT)
 static struct ftdi_transfer_control *tc_write = NULL;