If you are referring to the second Jum’ah prayer being performed in
the same masjid, if you are going to join the imam in the second
rak’ah, this is mandatory for you to do so.

Is it better to catch the 2nd rakat of jummah salah or to wait and let it finish then start from the second khutba?

Prayer | November 17, 2014 7:27 pm
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If I see congregation going on, and I don’t know whether the imam pronounce Z’A(Zulm) instead of walaDD(Daad)aalleeeen or says correctly. Should I join the congregation? What if I join and later come to know that they don’t say properly? What if they think I am wrong?
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What should a worshipper do if he makes a mistake in prayer?