[PATCH] shell: Don't try to switch to a NULL shell surface.

[Rafael Antognolli]

Fixes the crash from alt+tab when there's a fullscreen surface.
---
 desktop-shell/shell.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/desktop-shell/shell.c b/desktop-shell/shell.c
index 0b6a97c..18b88f4 100644
--- a/desktop-shell/shell.c
+++ b/desktop-shell/shell.c
@@ -5174,6 +5174,8 @@ switcher_next(struct switcher *switcher)
 
 	wl_list_for_each(view, &ws->layer.view_list, layer_link) {
 		shsurf = get_shell_surface(view->surface);
+		if (!shsurf)
+			break;
 		switch (shsurf->type) {
 		case SHELL_SURFACE_TOPLEVEL:
 			if (shsurf->parent)
-- 
1.8.3.1