From 5237fcd2b77745cba42733a051dfc5cca5bd1204 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaakko=20Ker=C3=A4nen?= <jaakko.keranen@iki.fi>
Date: Thu, 31 Dec 2015 09:56:16 +0200
Subject: [PATCH] Fixed|liblegacy: Potential crash

---
 doomsday/sdk/liblegacy/src/concurrency.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doomsday/sdk/liblegacy/src/concurrency.cpp b/doomsday/sdk/liblegacy/src/concurrency.cpp
index ad0bd53e69..a1ece1e3f6 100644
--- a/doomsday/sdk/liblegacy/src/concurrency.cpp
+++ b/doomsday/sdk/liblegacy/src/concurrency.cpp
@@ -161,6 +161,12 @@ void Thread_SetCallback(thread_t thread, void (*terminationFunc)(systhreadexitst
 
 int Sys_WaitThread(thread_t handle, int timeoutMs, systhreadexitstatus_t *exitStatus)
 {
+    if(!handle)
+    {
+        if(exitStatus) *exitStatus = DENG_THREAD_STOPPED_NORMALLY;
+        return 0;
+    }
+
     CallbackThread *t = reinterpret_cast<CallbackThread *>(handle);
     assert(static_cast<QThread *>(t) != QThread::currentThread());
     t->wait(timeoutMs);