diff --git a/modules/gridmap/editor/grid_map_editor_plugin.cpp b/modules/gridmap/editor/grid_map_editor_plugin.cpp
index 5c3d945f52c..f543c903c32 100644
--- a/modules/gridmap/editor/grid_map_editor_plugin.cpp
+++ b/modules/gridmap/editor/grid_map_editor_plugin.cpp
@@ -1301,9 +1301,10 @@ void GridMapEditor::_update_cursor_instance() {
 		cursor_instance = RenderingServer::get_singleton()->instance_create2(cursor_mesh, scenario);
 	}
 
-	// Make the cursor translucent so that it can be distinguished from already-placed tiles.
-	RenderingServer::get_singleton()->instance_geometry_set_transparency(cursor_instance, 0.5);
-
+	if (cursor_instance.is_valid()) {
+		// Make the cursor translucent so that it can be distinguished from already-placed tiles.
+		RenderingServer::get_singleton()->instance_geometry_set_transparency(cursor_instance, 0.5);
+	}
 	_update_cursor_transform();
 }