I believe it may have been mentioned in a sermon. The enemy does attack the heart chakra, but that does not mean one should keep the chakra closed. Logically, the enemy attacks us in any way they can, but we don't respond by closing ourselves off.

We have the tools to remove these curses ourselves, with returning curses part one and two on the JoS.
I experienced so many issues and attacks on my heart chakra, and due to my lack of cleansing, it caused intense physical and emotional pain in that area. With deep cleansing and empowering the chakras daily, the issues will go away.