A series of “bad decisions” by KISS guitarist Ace Frehley contributed to his death, band frontman Gene Simmons told The Post.

Simmons condemned the substance abuse he suggested contributed to Frehley’s fatal fall down the stairs in his Morristown, NJ home studio, leading to a brain bleed that killed him days later on Oct. 16 at age 74.

“He refused [advice] from people that cared about him – including yours truly – to try to change his lifestyle. In and out of bad decisions. Falling down the stairs — I’m not a doctor — doesn’t kill you. There may have been other issues, and it breaks my heart,” said Simmons.

The Morris County medical examiner report lists the cause of death as a blunt trauma injury of the head due to a fall. It said a separate toxicology report on Frehley’s blood would

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