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No "Cheap Thrills" here ... Sia and her estranged husband Daniel Bernad have been ordered to enter a mediation session to try to hammer out the custody issues in their contentious divorce.

We broke the news earlier this week -- Daniel's emergency request for full custody was shot down by a judge ... but now, the judge is ordering them to get together for a mediation session over the custody and visitation issues for their 1-year-old, Somersault Wonder Bernad . Shutterstock Premier

In court docs obtained by TMZ, the former couple is being required to at least attempt to work through the issues before the next scheduled hearing. They've got 2 options -- handle things through a video conference with a mediator ... or use the Los Angeles court system's

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