I heard alot of people sayin that stopping yoga practise ( ASANAS ) will have certain harms ...
Is this true?

I don't think this is true. I do think that if you are going to yoga you must make sure you do it properly. If not, it may cause you some harm.

I am not quite sure that I understand your question well but I believe you're asking whether or not it's harmful do stop practicing yoga. If that's the case, I have never heard of anyone being hurt or having had an undesirable experience after having stopped doing it.

I think that the worse thing that could happen if you spot practicing yoga is that you won't be in shape anymore, but that's true if you discontinue doing any sort of exercise.