I need help on user story 13 error for javascript calculator project

When i run the code below ,the test suit shows the script error for user story 13!

    if(this.state.result.match(/\*\-\+/g)){this.setState({result:(eval(this.state.result.replace(/\*\-\+/g,"+"))||"")+""})

Challenge: Build a JavaScript Calculator

Screenshot_2020-08-27-06-47-14-790_com.android.chrome-01|310x499