BBSIM crash

The new BBSIM crashed with the exception below, during bringup test for 1 OLT, 2 ONUS.

{{DEBU[0021] Changing ONU OperState from down to up ID=3 module=ONU
DEBU[0021] Changing ONU InternalState from discovered to enabled IntfId=0 OnuId=3 OnuSn=BBSM00010003 module=ONU
DEBU[0021] Sent Indication_OnuInd AdminState=up IntfId=0 OnuId=3 OnuSn=BBSM00010003 OperState=up module=ONU
fatal error: concurrent map writes
fatal error: concurrent map writes

goroutine 22 [running]:
runtime.throw(0xa8934e, 0x15)
/usr/local/go/src/runtime/panic.go:617 +0x72 fp=0xc0003204f8 sp=0xc0003204c8 pc=0x42f7a2
runtime.mapassign_fast64(0x99a120, 0xc000164540, 0x100000000, 0x17386c0)
/usr/local/go/src/runtime/map_fast64.go:176 +0x344 fp=0xc000320538 sp=0xc0003204f8 pc=0x4148a4
github.com/opencord/omci-sim.OmciSim(0x100000000, 0xc000208150, 0x2c, 0x2c, 0x2c, 0x2c, 0x0, 0xa6e24d, 0xa6e24d)
/home/netsia/go/src/github.com/opencord/bbsim/vendor/github.com/opencord/omci-sim/omci_sim.go:55 +0x14f2 fp=0xc000320cb8 sp=0xc000320538 pc=0x8df502
github.com/opencord/bbsim/internal/bbsim/devices.Onu.handleOmciMessage(0x1, 0x0, 0x3, 0x0, 0x0, 0x0, 0x1, 0xc00003c130, 0xb, 0x1, ...)
/home/netsia/go/src/github.com/opencord/bbsim/internal/bbsim/devices/onu.go:357 +0x2bd fp=0xc000321008 sp=0xc000320cb8 pc=0x8f4c9d
github.com/opencord/bbsim/internal/bbsim/devices.Onu.processOnuMessages(0x1, 0x0, 0x3, 0x0, 0x0, 0x0, 0x1, 0xc00003c130, 0xb, 0x1, ...)
/home/netsia/go/src/github.com/opencord/bbsim/internal/bbsim/devices/onu.go:198 +0x89a fp=0xc000321eb0 sp=0xc000321008 pc=0x8f278a
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc000321eb8 sp=0xc000321eb0 pc=0x45c101
created by github.com/opencord/bbsim/internal/bbsim/devices.OltDevice.Enable
/home/netsia/go/src/github.com/opencord/bbsim/internal/bbsim/devices/olt.go:224 +0x4f9}}