App: be more thorough when checking surface-associated LayoutState

Signed-off-by: Marcus Fritzsch <marcus_fritzsch@mentor.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/app.cpp b/src/app.cpp
index 59b762d..6708706 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -493,7 +493,13 @@ char const *App::deactivate_surface(char const *drawing_name) {
       return "Cannot deactivate main_surface";
    }
 
-   struct LayoutState &state = **this->layers.get_layout_state(*surface_id);
+   auto o_state = *this->layers.get_layout_state(*surface_id);
+
+   if (! o_state) {
+      return "Could not find layer for surface";
+   }
+
+   struct LayoutState &state = *o_state;
 
    if (state.main == -1) {
       return "No surface active";