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Diffstat (limited to 'src/mesa/state_tracker/st_cb_fbo.c')
-rw-r--r--src/mesa/state_tracker/st_cb_fbo.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index 20894825f7f..62f23a15ec9 100644
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -648,7 +648,8 @@ st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
(void) buffer;
/* add the renderbuffer on demand */
- st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
+ if (fb->_ColorReadBufferIndex >= 0)
+ st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
}