C# WinForms Application crashes (0x4000001f)

My C# Application is using xulrunner and GeckoFx Web Browser to read some data from certain web pages and copy to another web page.

I have built it in VS 2013 and target .Net Framework is 4 Client Profile.

OS is Windows 7.

GeckoFx and xulrunner version is 21.0.

It keeps crashing like every 4 or 5 minutes. I found the following from Windows log:

Имя сбойного приложения (Problem application name): ReadData33.exe, версия (version): 1.0.4.0, отметка времени: 0x552f5751
Имя сбойного модуля (Problem module name): mozalloc.dll, версия: 21.0.0.4879, отметка времени 0x518e99fc
Код исключения (Exception code): 0x4000001f
Смещение ошибки (Error offset): 0x0000111b
Идентификатор сбойного процесса (Problem process ID): 0x1440
Время запуска сбойного приложения (Problem app start time): 0x01d07999c45d93e9
Путь сбойного приложения (Problem app path): C:\ReadData\ReadData33.exe
Путь сбойного модуля (Problem module path): C:\ReadData\xulrunner\mozalloc.dll
Код отчета (Report code): b323d526-e58e-11e4-8328-74d435fc9ae5

I have tried to change target Framework version from 4 Client Profile to 4.0 and user PC has the appropriate version of Framework installed, but problem still exists.