stw: If stfb not set don't call into mesa

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c b/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
index de37d135dfe..f27f4cda218 100644
--- a/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
+++ b/src/gallium/state_trackers/wgl/shared/stw_framebuffer.c
@@ -118,7 +118,8 @@ stw_call_window_proc(
           * be called from any thread.
           */
          pipe_mutex_lock( fb->mutex );
-         st_resize_framebuffer( fb->stfb, width, height );
+         if (fb->stfb)
+            st_resize_framebuffer( fb->stfb, width, height );
          pipe_mutex_unlock( fb->mutex );
       }
    }