commit f04979ae481acc9fdc423da06514c4d557edd7cd
Author: Mathias Hopf <mhopf@suse.de>
Date:   Fri Mar 16 08:28:34 2007 -0600

    added null xmctx check to XMesaResizeBuffers(), bug 7205

diff --git a/src/mesa/drivers/x11/xm_api.c b/src/mesa/drivers/x11/xm_api.c
index cbbbd56..ba020fc 100644
--- a/src/mesa/drivers/x11/xm_api.c
+++ b/src/mesa/drivers/x11/xm_api.c
@@ -2499,6 +2499,8 @@ XMesaResizeBuffers( XMesaBuffer b )
 {
    GET_CURRENT_CONTEXT(ctx);
    XMesaContext xmctx = XMESA_CONTEXT(ctx);
+   if (!xmctx)
+      return;
    xmesa_check_and_update_buffer_size(xmctx, b);
 }