From ae57b4303ee71c864263eea05e78fd62439e3a88 Mon Sep 17 00:00:00 2001
From: Evelyne Donnaes <evelyne.donnaes@arm.com>
Date: Thu, 6 Feb 2020 15:19:18 +0000
Subject: [PATCH] Fix thread_sleep_for zero

---
 platform/source/mbed_os_timer.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/platform/source/mbed_os_timer.cpp b/platform/source/mbed_os_timer.cpp
index 8f7525465f..9b9bec1270 100644
--- a/platform/source/mbed_os_timer.cpp
+++ b/platform/source/mbed_os_timer.cpp
@@ -231,7 +231,9 @@ void do_timed_sleep_relative_or_forever(uint32_t wake_delay, bool (*wake_predica
 {
     // Special-case 0 delay, to save multiple callers having to do it. Just call the predicate once.
     if (wake_delay == 0) {
-        wake_predicate(wake_predicate_handle);
+        if (wake_predicate) {
+            wake_predicate(wake_predicate_handle);
+        }
         return;
     }