Outlook 15.23 crashes Exception: EXC_BAD_ACCESS Exception Code: KERN_INVALID_ADDRESS (0x0000000000000000)

MS Outlook - latest build 15.23 is crashing with the following error:

Error Signature:

Exception: EXC_BAD_ACCESS

Exception Code: KERN_INVALID_ADDRESS (0x0000000000000000)

Date/Time: 2016-06-14 11:14:34 +0000

Application Name: Microsoft Outlook

Application Bundle ID: com.microsoft.Outlook

Application Signature: OPIM

Application TimeStamp: 0x5752c12a

Application Version: 15.23.0.160604

Crashed Module Name: Microsoft Outlook

Crashed Module Version: 15.23.0.160604

Crashed Module Offset: 0x006e509b

Blame Module Name: Microsoft Outlook

Blame Module Version: 15.23.0.160604

Blame Module TimeStamp: 0x5752c12a

Blame Module Offset: 0x00000000006e509b

StackHash: ffffbbf4

Application LCID: 1033

Extra app info: Reg=en Loc=0x0409

Crashed thread: 3

Operating System Information

Operating System: Mac OS X 10.11.5 (Build 15F34)

CPU: Intel x86, Logical CPU Count: 8, Frequency: 2400 MHz

Physical Memory: 16384 MB

Device: x86_64

Screen: 1440.000000 x 900.000000, bitsPerPixel = 24, frame = 0.000000, 0.000000, 1440.000000, 900.000000

Microsoft Application Information:

Error Reporting UUID: 12A89389-3B85-4E38-A2CB-87CB107904FE

ULS UUID: 120C2135-9A91-4701-B732-0C09EFFAEB91

Rules Engine Session ID:

Time from launch: 0 hours, 0 minutes, 33 seconds

Total errors on this client: 21

Crashed App Virtual Memory Size: 1441.597

Crashed App Resident Memory Size: 159.2695

On different launch attempts I have noticed that the crashed thread will change. This is thread 3, other times it has been thread 5 or thread 8.

How can this be resolved?
Thanks