diff --git a/keysign/QRCode.py b/keysign/QRCode.py
index e37d06c9035e46ab72c0e6beaae34629d66b71b6..30ff970864f51893eac3612f293fd65d269f3c2d 100755
--- a/keysign/QRCode.py
+++ b/keysign/QRCode.py
@@ -249,7 +249,7 @@ class FullscreenQRImageWindow(Gtk.Window):
         '''Connected to the button-release-event and closes this
         window''' # It's unclear whether all resources are free()d
         self.log.info('Event on fullscreen: %s', event)
-        if event.button == 1:
+        if self.get_visible() and event.button == 1:
             self.unfullscreen()
             self.hide()
             self.close()