Debug Assertion Failed

[rrockru]

I'm try to compile Qt and project with static C-runtime with Visual Studio 2012 from command prompt.
Then i try to debug project it show message:
@file:f\dd\vctools\crt_bld\self_x86\crt\src\dbgheap.c
Line: 1424
Expression: _pFirstBlock == pHead@

Code that throw this message is
@QTextEdit *myEdit = new QTextEdit@

Steps that i doing:

1. In mkspecs\win32-msvc2012\qmake.conf change all /MD to /MT and /MDd to /MTd, from "CONFIG +=" delete "embed_manifest_dll embed_manifest_exe"
2. Configuring Qt with
   @configure -opengl desktop -mp -nomake tests -nomake examples -fully-process -opensource \ -confirm-license -platform win32-msvc2012@
3. Make Qt.

How can i prevent this message?