From: Alex Wu <[email protected]>

This can happen for instance running a toytoolkit application, launching
the popup menu and then clicking on a surface that does not belong to
the client that create the popup surface.
---
 src/shell.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/shell.c b/src/shell.c
index ac7301a..86edaf6 100644
--- a/src/shell.c
+++ b/src/shell.c
@@ -1414,12 +1414,15 @@ click_to_activate_binding(struct wl_input_device 
*device,
        struct weston_surface *upper;
 
        focus = (struct weston_surface *) device->pointer_focus;
-       upper = container_of(focus->link.prev, struct weston_surface, link);
-       if (focus->link.prev != &compositor->surface_list &&
-           get_shell_surface_type(upper) == SHELL_SURFACE_FULLSCREEN) {
-               printf("%s: focus is black surface, raise its fullscreen 
surface\n", __func__);
-               shell_stack_fullscreen(get_shell_surface(upper));
-               focus = upper;
+
+       if (focus) {
+               upper = container_of(focus->link.prev, struct weston_surface, 
link);
+               if (focus->link.prev != &compositor->surface_list &&
+                   get_shell_surface_type(upper) == SHELL_SURFACE_FULLSCREEN) {
+                       printf("%s: focus is black surface, raise its 
fullscreen surface\n", __func__);
+                       shell_stack_fullscreen(get_shell_surface(upper));
+                       focus = upper;
+               }
        }
 
        if (state && focus && device->pointer_grab == 
&device->default_pointer_grab)
-- 
1.7.5.4

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