this = 0xfeeefeee {m_instrumentingAgents=??? m_inspectorState=??? m_injectedScriptManager=??? ...} WebCore::InspectorDebuggerAgent * const > WebKit.dll!WebCore::InspectorDebuggerAgent::cancelPauseOnNextStatement() Line 327 + 0x3 bytes C++ WebKit.dll!WebCore::InspectorInstrumentation::cancelPauseOnNativeEvent(WebCore::InstrumentingAgents * instrumentingAgents=0x09a8c6e0) Line 836 C++ WebKit.dll!WebCore::InspectorInstrumentation::didFireTimerImpl(const std::pair<WebCore::InstrumentingAgents *,int> & cookie=(0x09a8c6e0 {m_inspectorAgent=0x0914bc60 m_inspectorPageAgent=0x09abc020 m_inspectorCSSAgent=0xfeeefeee ...},0)) Line 319 + 0xb bytes C++ WebKit.dll!WebCore::InspectorInstrumentation::didFireTimer(const std::pair<WebCore::InstrumentingAgents *,int> & cookie=(0x09a8c6e0 {m_inspectorAgent=0x0914bc60 m_inspectorPageAgent=0x09abc020 m_inspectorCSSAgent=0xfeeefeee ...},0)) Line 576 + 0x9 bytes C++ WebKit.dll!WebCore::DOMTimer::fired() Line 150 + 0x9 bytes C++ WebKit.dll!WebCore::ThreadTimers::sharedTimerFiredInternal() Line 112 + 0xf bytes C++ WebKit.dll!WebCore::ThreadTimers::sharedTimerFired() Line 91 C++ WebKit.dll!WebCore::TimerWindowWndProc(HWND__ * hWnd=0x005f1910, unsigned int message=49709, unsigned int wParam=0, long lParam=0) Line 103 + 0x8 bytes C++ user32.dll!_InternalCallWinProc@20() + 0x23 bytes Occurs on Windows (Debug, if it makes any difference).