From: Toni Wilen <twilen@winuae.net>
Date: Sat, 28 Apr 2018 12:25:06 +0000 (+0300)
Subject: Fix crash when switching CPU modes in lagless vsync.
X-Git-Tag: 4000~93
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=215132015dee597dda6ea02cd61dd8a3cef72ba0;p=francis%2Fwinuae.git

Fix crash when switching CPU modes in lagless vsync.
---

diff --git a/od-win32/win32gfx.cpp b/od-win32/win32gfx.cpp
index 3aff5215..27e598dd 100644
--- a/od-win32/win32gfx.cpp
+++ b/od-win32/win32gfx.cpp
@@ -490,7 +490,7 @@ static void display_vblank_thread(struct AmigaMonitor *mon)
 		return;
 	// It seems some Windows 7 drivers stall if D3DKMTWaitForVerticalBlankEvent()
 	// and D3DKMTGetScanLine() is used simultaneously.
-	if (os_win8 && ap->gfx_vsyncmode && pD3DKMTWaitForVerticalBlankEvent && wait_vblank_display->HasAdapterData) {
+	if (os_win8 && ap->gfx_vsyncmode && pD3DKMTWaitForVerticalBlankEvent && wait_vblank_display && wait_vblank_display->HasAdapterData) {
 		waitvblankevent = CreateEvent(NULL, FALSE, FALSE, NULL);
 		waitvblankthread_mode = 1;
 		unsigned int th;