diff --git a/src/mesa/drivers/dri/i965/brw_draw.c b/src/mesa/drivers/dri/i965/brw_draw.c
index 7e29dcf..f8fbd96 100644
--- a/src/mesa/drivers/dri/i965/brw_draw.c
+++ b/src/mesa/drivers/dri/i965/brw_draw.c
@@ -356,7 +356,7 @@ intel_disable_rb_aux_buffer(struct brw_context *brw,
       const struct intel_renderbuffer *irb =
          intel_renderbuffer(fb->_ColorDrawBuffers[i]);
 
-      if (irb && irb->mt->bo == tex_mt->bo &&
+      if (irb && irb->mt && irb->mt->bo == tex_mt->bo &&
           irb->mt_level >= min_level &&
           irb->mt_level < min_level + num_levels) {
          found = brw->draw_aux_buffer_disabled[i] = true;