Streaming platform HBO announced on Friday the closure of the series Westworld, just a few months after the completion of its fourth season, Variety reports.

The series, which has received 54 Emmy nominations over the course of its run, was set to conclude with a fifth season, according to recent statements by two of its showrunners, creative team Jonathan Nolan and Lisa Joy.

Instead, HBO’s decision was due to several reasons, including high production costs, declining viewership and deteriorating critical response amid a general cost-cutting effort at its newly formed parent company Warner Bros. Discovery. The series set records when it premiered, but its viewership has declined with each season, with a particularly sharp drop seen in the fourth season, which recently aired.

Calling Westworld “one of the highlights” of their careers, Nolan and Joy said in a statement that they were “privileged to tell these stories about the future of consciousness – both human and beyond – in the short time before the AI overlords forbade us to do so.”

But that’s not the end of the creative journey for the duo: their production company has a deal with Amazon, and they are working on a new TV series based on the legendary Fallout video game franchise.