Don't crash if we have no WindowTitleUpdater registered

Subsurface-mobile doesn't have a window title with the name of our file
name at this point, so simply don't try to trigger the update.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/windowtitleupdate.cpp b/windowtitleupdate.cpp
index eec324c68..963455f1d 100644
--- a/windowtitleupdate.cpp
+++ b/windowtitleupdate.cpp
@@ -27,5 +27,6 @@ void WindowTitleUpdate::emitSignal()
 extern "C" void updateWindowTitle()
 {
 	WindowTitleUpdate *wt = WindowTitleUpdate::instance();
-	wt->emitSignal();
+	if (wt)
+		wt->emitSignal();
 }