--- a/libpurple/protocols/facebook/data.c Mon Jun 15 08:17:50 2015 -0400 +++ b/libpurple/protocols/facebook/data.c Wed Jun 17 21:58:16 2015 -0400 @@ -205,7 +205,7 @@ { FbDataPrivate *priv; - g_return_val_if_fail(FB_IS_DATA(fata), NULL); + g_return_val_if_fail(FB_IS_DATA(fata), 0); priv = fata->priv; return priv->chatid++;