##Original Script##
while true; do
    if [[ ! -f "Test.FChk" && -f "run.log" ]]; then
        echo "Checking job status..."
        sleep 5
        printf "Calculation failed, script endedn"
        return
    elif [[ -f "Test.FChk" && -f "run.log" ]]; then
        break
    fi
done

##Troublesome Part##
        printf "Calculation failed, script endedn"
        return