Calculating multiple Choice field values

[ServNowDev]

I have 5 choice fields on a form, 

choice field 1 = label of Yes and a value of 3

                           label of NO and Value of 0

choice field 2 = label of Yes and a value of 3

                           label of NO and Value of 0

choice field 3 = label of Yes and a value of 3

                           label of NO and Value of 0

choice field 4 = label of Yes and a value of 3

                           label of NO and Value of 0

I also have a field Integer that will hold the total

I want to capture the yes and no of each choice and add the sum to the total field. Here is my business rule i am using , after update 

    var fieldstoTotal = ['current.choice_field1', 'current.choice_field2', 'current.choice_field3', 'current.choice_field4'];
    var total = 0;

    fieldstoTotal.forEach(function(fieldName) {
        var fieldValue = parseFloat(current.getValue(fieldName)) || 0;
        total += fieldValue;

    });
	current.setValue('survey_score', total);

for some reason im not sure why its coming back undefined for the fields.

[ServNowDev]

I am still getting an error that i cannot convert  Null to an object

[Sainath N · Accepted solution]

@ServNowDev : To replicate the scenario, I created two choice fields, similar to your use case, and I executed the script that I posted earlier, which is working. Please refer to the below screenshots.

For one of the Incident record, I have updated the choice values as per the below. 

Executed the same script from BG and I got the desired output. Please refer below screenshot.

Please make sure that your code is correct as per the sample I provided and test it out.

Please mark this as correct answer and helpful if it resolved, or mark this helpful if this help you to reach towards solution.