diff --git a/graph.lua b/graph.lua
index 4f1b771..a65818c 100644
--- a/graph.lua
+++ b/graph.lua
@@ -37,7 +37,7 @@ function self.update(dt)
   local mx, my = love.mouse.getPosition()
 
   if not (love.mouse.isDown(1) and mx > x and mx < x + w and my > y and my < y + h) then
-    timer = (timer + dt * (slider.kvalue('bpm')/120)) % 2
+    timer = (timer + dt * ((slider.kvalue('bpm') or 120)/120)) % 2
   else
     timer = mix(timer, (mx - x) / w, dt * 14)
   end