I just wanted to share that the latest few nightly builds on OS X crash a lot with this same error:

Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000018
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [3716]

The crashes occur after starting EKOS and loading the various drivers. It does not matter which driver I load, or in what order.
Oddly, after a few attempts, it will work.