WoWInterface - Crashing without fatal error from IMECandidatesFrame

When you input Chinese (or any other languages?) via the IMECandidatesFrame and keep holding backspace to delete the characters, WowB-64.exe will crash without throwing any fatal errors.

If I tap backspace 1 by 1, it won't crash, but if I hold it, it crashes it.
No new errors get saved in the \World of Warcraft Beta\Errors folder.
I can't reproduce it consistently. It seems to happen randomly; sometimes it would work fine, other times it would crash :confused:

Edit: It mostly happens whenever the IMECandidatesFrame gets hidden on removing the last candidate while holding backspace. But also in a lot of different other cases. Sometimes the game can even freeze for a while.

OS: Windows 10 (10586.318)
WoW: 7.0.3 Build 21796
No addons loaded and no fonts overridden

I input with an added Windows 10 Chinese IME:

Windows Logs:

Information 28-5-2016 20:47:59

Code:

Fault bucket 120482531500, type 4

Event Name: APPCRASH

Response: Not available

Cab Id: 0



Problem signature:

P1: WowB-64.exe

P2: 7.0.3.21796

P3: 57446cb5

P4: StackHash_b5f0

P5: 10.0.10586.306

P6: 571af2eb

P7: c0000374

P8: PCH_F7_FROM_ntdll+0x00000000000A5C34

P9: 

P10: 



Attached files:

C:\Users\sgpng\AppData\Local\Temp\WER71AB.tmp.WERInternalMetadata.xml



These files may be available here:

C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_WowB-64.exe_537def6cb7af0dae13412961c674c9faef457_a5cc2731_1ec979c9



Analysis symbol: 

Rechecking for solution: 0

Report Id: 10e8c5d9-f6a2-401c-8e8d-38c12ad7ff0f

Report Status: 1

Hashed bucket: 05c1fffb11b30278ccfede8f4b2e8cc4

Error 28-5-2016 20:47:56

Code:

Faulting application name: WowB-64.exe, version: 7.0.3.21796, time stamp: 0x57446cb5

Faulting module name: ntdll.dll, version: 10.0.10586.306, time stamp: 0x571af2eb

Exception code: 0xc0000374

Fault offset: 0x00000000000ee6fc

Faulting process id: 0x19dc

Faulting application start time: 0x01d1b911159b6ecb

Faulting application path: D:\Game\World of Warcraft Beta\WowB-64.exe

Faulting module path: C:\Windows\SYSTEM32\ntdll.dll

Report Id: 10e8c5d9-f6a2-401c-8e8d-38c12ad7ff0f

Faulting package full name: 

Faulting package-relative application ID: