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The mercy of Allah destroys the idea of karma. If a Muslim is sincerely repentant, his evil actions may be forgiven and he may be protected from any calamity.

Some verses from the Qur'an:

And when We let the people taste mercy, they rejoice therein, but if evil afflicts them for what their hands have put forth, immediately they despair. 30:36

But if they turn away - then We have not sent you, [O Muhammad], over them as a guardian; upon you is only [the duty of] notification. And indeed, when We let man taste mercy from us, he rejoices in it; but if evil afflicts him for what his hands have put forth, then indeed, man is ungrateful. 42:48

So how [will it be] when disaster strikes them because of what their hands have put forth and then they come to you swearing by Allah , "We intended nothing but good conduct and accommodation." 4:62

That is for what your hands have put forth [of evil] and because Allah is not ever unjust to His servants." 8:51