How to use with mathjs?

I trying 
```js
import { create, all } from 'mathjs'

const math = create(all, {})

const expressionFromUser = 'sum(1,1)'

const result = safeEval(expressionFromUser.replace(/sum/gi, `math.sum`), { math })
```
but I am getting the following error:
```
TypeError: x.constructor is undefined
```