Question Crashing Problem

[Synthile]

Every couple minutes when I'm sailing, my game will just crash. I'm on a mac and the message says
Crashed Thread: Unknown

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000010
Exception Note: EXC_CORPSE_NOTIFY
What does this mean and what can I do to fix it, thanks!

 

[Knight99]

Same just now crashed with 8 skulls and later my crew with Server reset