ASSERT after inplace edit finish

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   HI;

I'm using the report control inside a modal dialog box. Whenever i finish editing (by pressing return or escape or ...) I get an ASSERT in CWnd::AssertValid() (line 902 in wincore.cpp).

#ifdef _DEBUG
void CWnd::AssertValid() const
{
    if (m_hWnd == NULL)
        return;     // null (unattached) windows are valid

    // check for special wnd??? values
    ASSERT(HWND_TOP == NULL);       // same as desktop
    if (m_hWnd == HWND_BOTTOM)
        ASSERT(this == &CWnd::wndBottom);
    else if (m_hWnd == HWND_TOPMOST)
        ASSERT(this == &CWnd::wndTopMost);
    else if (m_hWnd == HWND_NOTOPMOST)
        ASSERT(this == &CWnd::wndNoTopMost);
    else
    {
        // should be a normal window
        ASSERT(::IsWindow(m_hWnd));    <--- ASSERT happens here

        // should also be in the permanent or temporary handle map
        CHandleMap* pMap = afxMapHWND();
        ASSERT(pMap != NULL);

        CObject* p=NULL;

And here is the call stack:

How can I avoid this assert?