Unity editor keeps crashng...

I am developing a puzzle game which is similar to 1010. A little more complicated one.
When I work in the Scene view (zoom in/out, precisely) using the mouse, it crashes. Unity is just closed.
And problem report window pops up saying…
I can’t figure out what possibly cause this crash.
Any help will be so appreciated. I can’t go on because of this. ㅠㅠ
I am using MacBook Air, OSX 10.10.5 & Unity 5.2.1 personal.
Thanks for reading.

Process: Unity [3226]
Path: /Applications/Unity 5 ㄴ/Unity.app/Contents/MacOS/Unity
Identifier: com.unity3d.UnityEditor5.x
Version: Unity version 5.2.1f1 (5.2.1f1)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Unity [3226]
User ID: 501

Date/Time: 2015-10-29 15:18:32.658 +0900
OS Version: Mac OS X 10.10.5 (14F1021)
Report Version: 11
Anonymous UUID: AD010540-BD25-33B5-49E4-F73FF618C216

Time Awake Since Boot: 6900 seconds

Crashed Thread: 38 UnityGfxDeviceWorker

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Application Specific Information:
abort() called

Thread 0:: CrBrowserMain Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff9466351a semaphore_wait_trap + 10
1 libdispatch.dylib 0x00007fff919817f6 _dispatch_semaphore_wait_slow + 213
2 com.unity3d.UnityEditor5.x 0x000000010235bf07 PlatformSemaphore::WaitForSignal() + 23
3 com.unity3d.UnityEditor5.x 0x000000010238fc8e GfxDeviceClient::AcquireThreadOwnership() + 286

You are better off reporting an official bug