diff --git a/0084-update_sliders b/0084-update_sliders
index 8107f28..8b336a5 100644
--- a/0084-update_sliders
+++ b/0084-update_sliders
@@ -1,4 +1,5 @@
 update_sliders = function(State, x)
+	if State.slider_handlers == nil then return end  -- very first frame
 	for name, slider in pairs(State.slider_handlers) do
 		if State.selected_slider == name then
 			slider.update(slider_value(slider, x))