Untitled-6

 src/backends/x11/meta-monitor-manager-xrandr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/backends/x11/meta-monitor-manager-xrandr.c b/src/backends/x11/meta-monitor-manager-xrandr.c
index dbe3e4e..7a9294b 100644
--- a/src/backends/x11/meta-monitor-manager-xrandr.c
+++ b/src/backends/x11/meta-monitor-manager-xrandr.c
@@ -843,7 +843,9 @@ meta_monitor_manager_xrandr_calculate_monitor_mode_scale (MetaMonitorManager *ma
                                                           MetaMonitor        *monitor,
                                                           MetaMonitorMode    *monitor_mode)
 {
-  return meta_monitor_calculate_mode_scale (monitor, monitor_mode);
+  g_return_val_if_fail (monitor != NULL && monitor_mode != NULL, 1.0);
+
+  return meta_monitor_calculate_mode_scale(monitor, monitor_mode);
 }

 static void