Things weren’t so happy at the Happy Buddha vegetarian restaurant in Queens yesterday — when the owner allegedly stabbed an ex-worker outside.

James Lin, 61, was charged with attempted criminally negligent homicide and other charges after the 10:50 a.m. attack in Flushing, cops said.

The victim, stabbed eight times, was treated at New York Hospital Queens.

It was unclear what sparked the bloodshed, cops said.