This is baseless. YOu may perform as many Umrah as you can or wish

Someone told me that it is not permissible to perform umrah before hajj; if we perform it before hajj it is sinful. Please clear my doubt.

Hajj and Umrah | September 17, 2015 3:15 am
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The farewell tawaf is mandatory for one who is leaving Mecca . Also it should be the last thing done. The flight bookings were made well in advance and now re scheduling isn’t available. ( since there is a great chance we might miss our flight) is it allowed that we do the stoning and leave for Jeddah straight from Mina or do the farewell tawaf on the 11th zilhujj.
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When I performed Hajj, I did not spend the 11th and 12th nights (of Dhul-Hijjah) in Mina, since nobody from my kafela (group) did so and I (not being familiar with the streets and roads of Saudi Arabia) was unable to go and stay in Mina alone without my companions. Now, do I have to do anything about it?