diff --git a/mpv/.config/mpv/scripts/battery.lua b/mpv/.config/mpv/scripts/battery.lua
index 3133cde..d880946 100644
--- a/mpv/.config/mpv/scripts/battery.lua
+++ b/mpv/.config/mpv/scripts/battery.lua
@@ -4,7 +4,10 @@ local lqprofile = "lowquality"
 local hqprofile = "highquality"
 
 local function powerstate()
-  local f = assert(io.open("/sys/class/power_supply/AC/online"))
+  local f =io.open("/sys/class/power_supply/AC/online")
+  if f == nil then
+    return
+  end
   local t = f:read("*n")
   f:close()
   return t