Accessed none trying to read property after restart the Engine

Hello there!

I have used two different pack on my on own project. First has enemy component (health), and the second is a boss pack with health to. I would like to fusion the two pack. And I did it after a lot of hours. Boss pack now use the enemy component, and refresh the health value from the enemy component. Everthing is work correctly SINCE I restarted the Engine. After not working. I got Accessed none trying to read error. Didn’t set the boss max health and health from the enemy component health. I got 0 in every frame. Everthing is same… My brain is melted. If I deleted the boss component and add again, and add the connections again, everthing work well again, SINCE I restarted the Engine. What is this? If I quit from UE and wait a few sec and restart again I lost boss component and I need to add again…

Thanks for any help!