Sorry, fix missed, related #590.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/ipc.c b/src/ipc.c
index 7f8f0668e5..8c12f701b0 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 */