I want to create a program where if the value of ‘Bab’: null, then babParagraph will not appear. However, when I create the following conditional statement, I encounter an error message saying ‘Cannot convert undefined or null to object’.
ps: im using docx

here my code snippet:

let babParagraph = null; // Initialize babParagraph with null

        // check if item.bab isn't null
        if (item.bab !== null) {
            // if item.bab isn't null, create babParagraph
            babParagraph = new Paragraph({
                children: [
                    new docx.TextRun({
                        text: 'Bab ' + item.bab,
                    }),
                    new docx.TextRun({
                        text: 'nKetentuan Umum',
                        break: 1,
                    }),
                ],
                alignment: AlignmentType.CENTER,
            });
        }

and then error appear:

var _name = Object.keys(value)[0];
                           ^
TypeError: Cannot convert undefined or null to object
 at Function.keys (<anonymous>)
    at d:magangjson_ke_wordnode_modulesdocxbuildindex.cjs:18745:32 
    at Array.forEach (<anonymous>)
    at resolve (d:magangjson_ke_wordnode_modulesdocxbuildindex.cjs:18743:1618743:16)
    at d:magangjson_ke_wordnode_modulesdocxbuildindex.cjs:18749:28 
    at Array.forEach (<anonymous>)
    at resolve (d:magangjson_ke_wordnode_modulesdocxbuildindex.cjs:18743:1618743:16)
    at d:magangjson_ke_wordnode_modulesdocxbuildindex.cjs:18749:28 
    at Array.forEach (<anonymous>)
    at resolve (d:magangjson_ke_wordnode_modulesdocxbuildindex.cjs:18743:1618743:16)

Node.js v20.11.1