Fix crash in OS X with on-monitor effects.

On-monitor effects does not work in OS X, but now with it enabled it
does not immediately crash.

svn path=/trunk/kdenlive/; revision=4716

diff --git a/src/monitor.cpp b/src/monitor.cpp
index b9f1ed262a33c8eb83b385476018e2a5ddbab155..03fae41060a4df13901eb4baf62e2881b5d826c0 100644 (file)
--- a/src/monitor.cpp
+++ b/src/monitor.cpp
@@ -839,7 +839,7 @@ QStringList Monitor::getZoneInfo() const
 
 void Monitor::slotEffectScene(bool show)
 {
-    if (m_name == "project" && !m_delStage) {
+    if (m_name == "project" && !m_delStage && m_monitorRefresh) {
         m_monitorRefresh->setVisible(!show);
         m_effectView->setVisible(show);
         if (show)