From 63c51fbfc87be2a3c7c460eca523721896957653 Mon Sep 17 00:00:00 2001
From: pathletboy <pathletboy@gmail.com>
Date: Mon, 23 Nov 2015 16:10:49 +0800
Subject: [PATCH] Sorry, fix missed, related #590.

---
 src/ipc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ipc.c b/src/ipc.c
index 7f8f0668e..8c12f701b 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -1188,7 +1188,8 @@ rt_err_t rt_event_recv(rt_event_t   event,
         level = rt_hw_interrupt_disable();
 
         /* set received event */
-        *recved = thread->event_set;
+        if (recved)
+            *recved = thread->event_set;
     }
 
     /* enable interrupt */
-- 
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