Fix bug: NullPointerException when  envvar is not set
Fix bug: NullPointerException when  envvar is not set

misaakidis/ceno,misaakidis/ceno,equalitie/ceno,equalitie/ceno,misaakidis/ceno,equalitie/ceno,misaakidis/ceno,equalitie/ceno,misaakidis/ceno,equalitie/ceno,equalitie/ceno,misaakidis/ceno