--- branches/release-1_3-branch/xvidcore/src/image/colorspace.c	2019/11/12 14:41:36	2179
+++ branches/release-1_3-branch/xvidcore/src/image/colorspace.c	2019/11/12 14:48:35	2180
@@ -102,6 +102,7 @@
 	int y_dif = y_stride - fixed_width;				\
 	int uv_dif = uv_stride - (fixed_width / 2);		\
 	int x, y;										\
+	if ((x_ptr == NULL) || (x_dif < 0)) return;		\
 	if (vflip) {								\
 		x_ptr += (height - 1) * x_stride;			\
 		x_dif = -(SIZE)*fixed_width - x_stride;		\