Nginx, Dehydrated cron script

#!/bin/bash
###VARS###
LETSENCRYPT_PATH='/srv/letsencrypt/'
CF_USERNAME="mail@example.com"
CF_TOKEN="TOKEN"
LOGFILE='/srv/letsencrypt/cron.error.log'
TIMEFORMAT="[$(date +"%y-%m-%d %H-%M")]"
#Please don't change
ERROR="true"
###COMMANDS###
if [[ "$CF_USERNAME" == "" || "$CF_TOKEN" == "" ]]; then
  echo "$TIMEFORMAT Please check file vars" >> $LOGFILE
  exit 1
fi
export PROVIDER=cloudflare
export LEXICON_CLOUDFLARE_USERNAME=$CF_USERNAME
export LEXICON_CLOUDFLARE_TOKEN=$CF_TOKEN
$LETSENCRYPT_PATH/dehydrated.sh --cron -f $LETSENCRYPT_PATH/config.sh && ERROR="false"
if [ "$ERROR" == "true" ]; then
  echo "$TIMEFORMAT Renew fail please check your config" >> $LOGFILE
  unset PROVIDER
  unset LEXICON_CLOUDFLARE_USERNAME
  unset LEXICON_CLOUDFLARE_TOKEN
  exit 1
else
  ERROR=true
fi
unset PROVIDER
unset LEXICON_CLOUDFLARE_USERNAME
unset LEXICON_CLOUDFLARE_TOKEN
nginx -t && nginx -s reload && ERROR="false"
if [ "$ERROR" == "true" ]; then
  echo "$TIMEFORMAT Nginx fail and it was not restarted" >> $LOGFILE
  exit 1
fi