bbp_get_reply_author_avatar( int $reply_id, int $size = 40 )

	function bbp_get_reply_author_avatar( $reply_id = 0, $size = 40 ) {
		$reply_id = bbp_get_reply_id( $reply_id );
		if ( !empty( $reply_id ) ) {
			// Check for anonymous user
			if ( !bbp_is_reply_anonymous( $reply_id ) ) {
				$author_avatar = get_avatar( bbp_get_reply_author_id( $reply_id ), $size );
			} else {
				$author_avatar = get_avatar( get_post_meta( $reply_id, '_bbp_anonymous_email', true ), $size );
			}
		} else {
			$author_avatar = '';
		}

		return apply_filters( 'bbp_get_reply_author_avatar', $author_avatar, $reply_id, $size );
	}