Debug Error !

When I’m debugging my code I get awindow that contain the following error message:

*
Debug Error!

Program: C:\Qt\Qt5.1.1\5.1.1\msvc2012\bin\Qt5Cored.dll
Module: 5.1.1
File: global\qglobal.cpp
Line: 2014

ASSERT :“y<m_height” in file
q:\qt5_workdir\w\s\qtbase\include\qtgui\5.1.1\qtgu i\private\../../../../../src/gui/painting/qpainteengine_raster_p.h, line 448

(Press Retry to debug the application)
*

My code draw a simple plot that contain a pendingValues as a vector of QPointF witch i recover from a simple thread
Anyone know what’s going on?

An assertion inside of the Qt raster paint engine - without knowing the callstack it is hard to say something useful.
But AFAIR there were some issues with the raster paint engine and Qt 5.1 - so maybe upgrading is a solution.

Uwe