IDE 2015 R4 Crash on Mac

Hi, i start working my webapp and when try to open some webpage the ide crash with following error:

Process: Xojo [3682]
Path: /Applications/Xojo 2015 Release 4/Xojo.app/Contents/MacOS/Xojo
Identifier: com.xojo.xojo
Version: 15.4.0.32248 (15.4.0.3.32248)
Code Type: X86 (Native)
Parent Process: ??? [1]
Responsible: Xojo [3682]
User ID: 501

Date/Time: 2015-12-26 02:10:35.209 -0400
OS Version: Mac OS X 10.11 (15A284)
Report Version: 11
Anonymous UUID: 50F7D10E-989F-BC5E-D30D-D2A15C689A44

Sleep/Wake UUID: EBA54DA9-F55B-42E4-A78A-A3FDC8B33B57

Time Awake Since Boot: 35000 seconds
Time Since Wake: 8500 seconds

System Integrity Protection: enabled

Crashed Thread: 1 Dispatch queue: com.apple.libdispatch-manager

Exception Type: EXC_CRASH (SIGSEGV)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

Thread 0:: Dispatch queue: com.apple.main-thread

In 2015 R4 IDE on windows the same webapp no crash.

Please Help