TypeError when using elemMod matcher

[xdghcnt]

module.exports = function (bh) {
    bh.match("test-block", function (ctx) {
        ctx.content([
            {
                elem:    'test-elem'
            },
            {
                elem:    'test-elem',
                elemMods:    {
                    mod: 'val'
                }
            }
        ]);
    });
    bh.match("test-block__test-elem", function (ctx) {
        ctx.content('test');
    });
    bh.match("test-block__test-elem_mod_val", function (ctx) {
        ctx.content('test');
    });
};

TypeError: Cannot read property 'mod' of undefined

Version is "3.1.2"
Ok in "2.2.0"

[mishanga]

Fixed in 3.1.3.
BTW, elemMods is deprecated, use just mods instead.