I like to know if this true that you shouldn't practice energy work during your practice of kunlun such as qigong.

If this is true, does that include meditation. I meditate couple time of day and I like to know this before anytihng.

 What is your definition of energy work and practices ?

Generally, when you practice Kunlun or any technique you should practice only that technique. Its not a good idea to mix practices rather keep them seperate. Kunlun can be be combined with few practices such as Red Phoenix and Golden flower. Kunlun and RP are in itself techniques of meditation.

What ever other style of meditation that you like and do, just do it before or afterwards or at a different time if you can.