Fix use before check null error

1 files changed, 1 insertions, 1 deletions

diff --git a/rc.lua b/rc.lua
index d4aa847..999d1f6 100644
--- a/rc.lua
+++ b/rc.lua
@@ -326,8 +326,8 @@ function act()
                 awful.spawn.easy_async("bash -c \"acpi | cut -d',' -f2 \"",
                     function(percent, stderr, reason, exit_code)
                         a, b = string.find( percent, "%%")
-                        nPercent = tonumber(string.sub(percent,2,a-1))
                         if a then
+                            nPercent = tonumber(string.sub(percent,2,a-1))
                             mybatwidget:set_text ("🔌 " .. nPercent .. "%")
                         end
                 end)