Fix: Overlay-Next: Null batch dereference

source/blender/draw/engines/overlay/overlay_next_outline.hh

@@ -176,6 +176,7 @@ class Outline : Overlay {
         break;
       case OB_VOLUME:
         geom = DRW_cache_volume_selection_surface_get(ob_ref.object);
+        /* TODO(fclem): Get rid of these check and enforce correct API on the batch cache. */
         if (geom) {
           prepass_volume_ps_->draw(geom, manager.unique_handle(ob_ref));
         }

source/blender/draw/engines/overlay/overlay_next_prepass.hh

@@ -201,6 +201,10 @@ class Prepass : Overlay {
         }
         geom_single = DRW_cache_volume_selection_surface_get(ob_ref.object);
         pass = mesh_ps_;
+        /* TODO(fclem): Get rid of these check and enforce correct API on the batch cache. */
+        if (geom_single == nullptr) {
+          return;
+        }
         break;
       case OB_POINTCLOUD:
         geom_single = point_cloud_sub_pass_setup(*point_cloud_ps_, ob_ref.object);