Why are you using the second alias ? You don't need it :

Code:
alias away_sys set -u %autoaw 1 | set -u %aw | set -u %naw | scon -at1 aw | if (%autoaw) && (!%aw) scon -at1 away Auto away after $duration(%away.system.auto.check,2) of idle | elseif (%naw) && (%aw) scon -at1 away
alias aw if ($idle < %away.system.auto.check) set -k %autoaw 0 | if ($away) set -k %aw 1 | else set -k %naw 1
This is tested

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