LMDB create product system ERROR: Access via 'NULL' object reference not possible. (termination: RABAX_STATE)

I am trying to assign technical system to product system in LMDB administration page in Solution manager 7.1.

Which gives the following error:

ERROR: Access via 'NULL' object reference not possible. (termination: RABAX_STATE)Image may be NSFW.
Clik here to view.Image may be NSFW.
Clik here to view.