Seg fault testing for Qt::app

Hello,
I'm having a little trouble with detecting whether or not a Qt::Application
object has already been created. I've tried the obvious:

my $application = Qt::Application() unless Qt::app();

but this causes a segmentation fault. The problem seems to be that the call
to Qt::app() tries to create a new reference from the sv_qapp pointer, even
though it has never been initialised by a call to Qt::Application(). Is
there a better way, or should this work?
If I'm not missing something obvious about why this should be, this little
patch to PerlQt/Qt.xs seems to fix it.

Cheers,
Alistair

--- Qt.xs.org   2003-09-18 23:46:33.000000000 +0000
+++ Qt.xs       2005-06-13 14:23:20.000000000 +0000
@@ -2175,7 +2175,10 @@
 SV *
 app()
     CODE:
-    RETVAL = newRV_inc(sv_qapp);
+    if(sv_qapp == 0)
+        RETVAL = &PL_sv_undef;
+    else
+        RETVAL = newRV_inc(sv_qapp);
     OUTPUT:
     RETVAL

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