Merge pull request #46617 from sps1112/fix-navigationmesh-crash

Add null check in NavigationMesh.new().create_from_mesh(BoxShape.new())

scene/resources/navigation_mesh.cpp

@@ -31,6 +31,8 @@
 #include "navigation_mesh.h"
 
 void NavigationMesh::create_from_mesh(const Ref<Mesh> &p_mesh) {
+	ERR_FAIL_COND(p_mesh.is_null());
+
 	vertices = Vector<Vector3>();
 	clear_polygons();