InputMonitor: don't try to deference an invalid Nux display

Fixes LP: #1632656 (bzr r4220.3.1)

1 files changed, 7 insertions, 4 deletions

diff --git a/unity-shared/InputMonitor.cpp b/unity-shared/InputMonitor.cpp
index 465c5afad..c7b70538a 100644
--- a/unity-shared/InputMonitor.cpp
+++ b/unity-shared/InputMonitor.cpp
@@ -225,7 +225,8 @@ struct Monitor::Impl
 
 void UpdateEventMonitor()
 {
- auto* dpy = nux::GetGraphicsDisplay()->GetX11Display();
+ auto* nux_dpy = nux::GetGraphicsDisplay();
+ auto* dpy = nux_dpy ? nux_dpy->GetX11Display() : gdk_x11_get_default_xdisplay();
 Window root = DefaultRootWindow(dpy);
 
 unsigned char master_dev_bits[XIMaskLen(XI_LASTEVENT)] = { 0 };
@@ -263,9 +264,9 @@ struct Monitor::Impl
 
 if (!pointer_callbacks_.empty() || !key_callbacks_.empty() || !barrier_callbacks_.empty())
 {
- if (!event_filter_set_)
+ if (!event_filter_set_ && nux_dpy)
 {
- nux::GetGraphicsDisplay()->AddEventFilter({[] (XEvent event, void* data) {
+ nux_dpy->AddEventFilter({[] (XEvent event, void* data) {
 return static_cast<Impl*>(data)->HandleEvent(event);
 }, this});
 
@@ -275,7 +276,9 @@ struct Monitor::Impl
 }
 else if (event_filter_set_)
 {
- nux::GetGraphicsDisplay()->RemoveEventFilter(this);
+ if (nux_dpy)
+ nux_dpy->RemoveEventFilter(this);
+
 event_filter_set_ = false;
 LOG_DEBUG(logger) << "Event filter disabled";
 }