Playing "All the Mods 7" with some friends which contains bigger reactors version 0.6.0-alpha.9.1

One of my players formed a reactor successfully but the reactor then crashed the server with the exception java.lang.NullPointerException: Cannot read field "insertion" because "this.controlRodsXZ[currentX][currentZ]" is null - this is thrown shortly after the reactor is loaded, causing the server to crash when a player joins or walks into the vicinity.

The full server crash can be found here: https://gist.github.com/bancey/b591f20ed60c69246942ef0718255d88

Resolved the issue temporarily by using a map editor to delete part of the multi block. We have another working reactor on the server so will compare the two to see if I can work out why one is causing this issue whilst the other is not. Will update here with any findings.

Cheers,
Alex