diff -r 3aa07f06a4b7 -r 31d52bbe209c windowing/windowserver/nga/SERVER/EVENT.CPP
--- a/windowing/windowserver/nga/SERVER/EVENT.CPP	Tue Apr 20 16:38:10 2010 +0100
+++ b/windowing/windowserver/nga/SERVER/EVENT.CPP	Fri Apr 23 14:57:14 2010 +0100
@@ -1021,7 +1021,9 @@
 		case TRawEvent::EKeyDown:
 			{
 			_LIT(KWSERVDebugLogKeyDownArrival,"Key down arrives %d");
-			if(CDebugBar* dbg = CWsTop::Screen()->DebugBar())
+			CScreen* screen = CWsTop::Screen();
+			WS_ASSERT_ALWAYS(screen, EWsPanicNoScreen);
+			if(CDebugBar* dbg = screen->DebugBar())
 				dbg->OnKeyEvent();
 			if (wsDebugLog)
 				wsDebugLog->MiscMessage(CDebugLogBase::ELogEverything,KWSERVDebugLogKeyDownArrival,aRawEvent.ScanCode());
@@ -1037,7 +1039,9 @@
 		case TRawEvent::EKeyUp:
 			{
 			_LIT(KWSERVDebugLogKeyUpArrival,"Key up arrives %d");
-			if(CDebugBar* dbg = CWsTop::Screen()->DebugBar())
+			CScreen* screen = CWsTop::Screen();
+			WS_ASSERT_ALWAYS(screen, EWsPanicNoScreen);
+			if(CDebugBar* dbg = screen->DebugBar())
 				dbg->OnKeyEvent();
 			if (wsDebugLog)
 				wsDebugLog->MiscMessage(CDebugLogBase::ELogEverything,KWSERVDebugLogKeyUpArrival,aRawEvent.ScanCode());