error log – illegal string for Admin CSS

Hi,
I added 2 small CSS codes using the admin & login places. Suddenly I received this message in my log :
Illegal string offset ‘language’ in wp-content/plugins/custom-css-js/includes/admin-screens.php on line 1390

Here is the code snippet where the error points to the first “language” argument :

    /**
     * Remove the JS/CSS file from the disk when deleting the post
     */
    function before_delete_post( $postid ) {
        global $post;
        if ( ! is_object( $post ) ) return;
        if ( 'custom-css-js' !== $post->post_type ) return;
        if ( ! wp_is_writable( CCJ_UPLOAD_DIR ) ) return; 

        $options     = get_post_meta( $postid, 'options', true ); 
        $slug        = get_post_meta( $postid, '_slug', true ); 
        $file_name   = $postid . '.' . $options['language'];

        @unlink( CCJ_UPLOAD_DIR . '/' . $file_name );

        if ( !empty( $slug ) ) {
            @unlink( CCJ_UPLOAD_DIR . '/' . $slug . '.' . $options['language'] );
        }
    }

What’s happening ?