From 0a35580e210df6a0548c114665f201ecd759eadd Mon Sep 17 00:00:00 2001
From: xquery <jim@webcomposite.com>
Date: Mon, 8 Jun 2020 13:25:56 +0200
Subject: multi: add defensive check on data->multi->num_alive

Closes #5540
---
 lib/multi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/multi.c b/lib/multi.c
index a614929ec..d20b33dbc 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -168,9 +168,11 @@ static void mstate(struct Curl_easy *data, CURLMstate state
   }
 #endif
 
-  if(state == CURLM_STATE_COMPLETED)
+  if(state == CURLM_STATE_COMPLETED) {
     /* changing to COMPLETED means there's one less easy handle 'alive' */
+    DEBUGASSERT(data->multi->num_alive > 0);
     data->multi->num_alive--;
+  }
 
   /* if this state has an init-function, run it */
   if(finit[state])
-- 
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