From 11c8cd43efe729b0ca8488a5160f4a66b6e34014 Mon Sep 17 00:00:00 2001
From: Vincent Wei <vincent@minigui.org>
Date: Thu, 13 Feb 2020 12:36:08 +0800
Subject: [PATCH] only check pdc->surface->dirty_info for wallpaper patter when
 it is not empty

---
 src/kernel/compsor-manager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/kernel/compsor-manager.c b/src/kernel/compsor-manager.c
index a853193c..369d9208 100644
--- a/src/kernel/compsor-manager.c
+++ b/src/kernel/compsor-manager.c
@@ -232,8 +232,8 @@ void __mg_composite_dirty_znodes (void)
 
     /* check wallpaper pattern */
     pdc = dc_HDC2PDC (HDC_SCREEN);
-    assert (pdc->surface->dirty_info);
     if (pdc->surface->w > 0 && pdc->surface->h > 0) {
+        assert (pdc->surface->dirty_info);
         lock_znode_surface (pdc, nodes);
         changes_in_dc = pdc->surface->dirty_info->dirty_age;
         if (changes_in_dc != nodes[0].changes) {