From 2dcadb22cc52867c55288eecf35f05d9ba757fe6 Mon Sep 17 00:00:00 2001
From: MrKepzie <alexandre230@msn.com>
Date: Tue, 11 Oct 2016 23:19:40 +0200
Subject: [PATCH] Fix crash on exit

---
 Engine/AppInstance.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Engine/AppInstance.cpp b/Engine/AppInstance.cpp
index a9ba670394..bc8c6297db 100644
--- a/Engine/AppInstance.cpp
+++ b/Engine/AppInstance.cpp
@@ -2230,6 +2230,9 @@ AppInstance::removeInvalidExpressionKnob(const KnobI* knob)
 void
 AppInstance::recheckInvalidExpressions()
 {
+    if (getProject()->isProjectClosing()) {
+        return;
+    }
     std::list<KnobPtr> knobs;
     {
         QMutexLocker k(&_imp->invalidExprKnobsMutex);