From e16373cfcfe4bc1d119ddc6ef448f821cd9e02b7 Mon Sep 17 00:00:00 2001
From: Alexander Bock <alexander.bock@liu.se>
Date: Sun, 7 Sep 2014 17:10:33 +0200
Subject: [PATCH] Fixed a bug that causes the application to crash if no
 listener is installed for a Property

---
 src/properties/property.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/properties/property.cpp b/src/properties/property.cpp
index f00890f9bd..b225be2861 100644
--- a/src/properties/property.cpp
+++ b/src/properties/property.cpp
@@ -127,7 +127,8 @@ void Property::setPropertyOwner(PropertyOwner* owner)
 }
 
 void Property::notifyListener() {
-	_onChangeCallback();
+	if (_onChangeCallback)
+		_onChangeCallback();
 }
 
 } // namespace properties