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-rw-r--r--src/gallium/state_trackers/glx/xlib/xm_api.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.c b/src/gallium/state_trackers/glx/xlib/xm_api.c
index a274da0c62f..4aac08a1084 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.c
@@ -1148,6 +1148,7 @@ void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
if (!surf_front || !surf_back)
return;
+ assert(pipe);
pipe->surface_copy(pipe,
surf_front, x, y, /* dest */
surf_back, x, y, /* src */