monitor: Fix crash when there is no write handler

diff --git a/monitor/att.c b/monitor/att.c
index 313ac91..cd319cf 100644 (file)
--- a/monitor/att.c
+++ b/monitor/att.c
@@ -2945,7 +2945,7 @@ static void print_write(const struct l2cap_frame *frame, uint16_t handle,
                return;
 
        handler = get_handler(attr);
-       if (!handler)
+       if (!handler || !handler->write)
                return;
 
        handler->write(frame);