From d76ca4e2e7e5c93ec92a4cf349ed62147a2b2148 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Tue, 19 Feb 2019 11:36:56 +0100
Subject: additional santity check for MQ users

---
 src/util/mq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/util/mq.c b/src/util/mq.c
index d2f5add19..72ab8b72d 100644
--- a/src/util/mq.c
+++ b/src/util/mq.c
@@ -964,6 +964,7 @@ GNUNET_MQ_send_cancel (struct GNUNET_MQ_Envelope *ev)
   {
     /* complex case, we already started with transmitting
        the message using the callbacks. */
+    GNUNET_assert (GNUNET_NO == mq->in_flight);
     GNUNET_assert (0 < mq->queue_length);
     mq->queue_length--;
     mq->cancel_impl (mq,
-- 
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