Industrial Foregoing Version: 3.6.33

Titanium Version: 4.0.37

I have 6 lime lenses and 4 laser drills. The issue seems to occur when the drill completes its progress (reaches 100) and when the depth is different than the default (set to 66). I tried setting the depth to 8 and to 2. Both made the server crash. The crash kept happening any time someone loaded the chunk the laser base was in.

Crashlog If Applicable (Upload to pastebin/gist):

IF crash report.txt