Here is what I know about “karma”. “Karma” is a belief that you get back, whatever you deserve… good or bad… from this life or previous lives.
It implies a belief in… or acceptance of reincarnation. Which the Catholic Church teaches us, is false.
"Death is the end of man’s earthly pilgrimage, of the time of grace and mercy which God offers him so as to work out his earthly life in keeping with the divine plan, and to decide his ultimate destiny. When “the single course of our earthly life” is completed, we shall not return to other earthly lives: “It is appointed for men to die once.” There is no “reincarnation” after death. (CCC 1013)
Hope this helps. God bless.