There has been an error of type TypeError, as the property 'replace' cannot be read from a null value

I encountered a TypeError message, even though my application seems to be functioning properly.

"ERROR TypeError: Cannot read property 'replace' of null"

I'm struggling to understand how to fix this issue. Can someone provide me with some guidance or help me comprehend why this error is occurring? https://i.stack.imgur.com/KIyw6.png

if (isInitial) {
    // Add Data Rows (initially)
    for (const row of rows) {
        const clientVisitGuid = row[2];
        const location = row[3];
        row[5] = row[5].replace(/\//g, '\/\u200B');
        const service = row[5];
        const rowId = `${service || 'zzz'}_${location}_${clientVisitGuid}`;
        const sortString = `${service || 'zzz'}_${location}_${clientVisitGuid}`;
        const daysPastDischarge = parseInt(row[6]);
        const isMarked = parseInt(row[7]) === 1 ? true : false;
        if (cbt.hasBodyRow(rowId) === false) {
            const values: Array<[string, string | number]> = [];
            let isAllClear = true;
            for (let i = 0; i < row.length; i++) {
                const colId: string = cbt.headerRow.headerCols[i].id;
                const colVal: string | number = row[i];
                if (cbt.headerRow.headerCols[i].isFlag === true && colVal !== 1) {
                    isAllClear = false;
                }
                values.push([colId, colVal]);
            }
            const valueHash = hash(JSON.stringify(row));
            cbt.addBodyRow(
                rowId,
                values,
                valueHash,
                sortString,
                daysPastDischarge,
                isMarked,
                isAllClear,
                true,
            );
        }
    }
}

Answer №1

The solution to resolving the issue is to verify the existence of the variable before attempting to substitute the string. Surround it with an IF statement as demonstrated below:

if(data[7]) {
    data[7] = data[7].replace(/\./g, '\.\u200B');
    const utility = data[7];
}

Answer №2

It appears that the data in row[5] is null. Before proceeding, make sure to verify if row[5] actually contains a value. You can do this by checking for its existence like so:

if(row[5]) {
     row[5] = row[5].replace(/\//g, '\/\u200B');
     const service = row[5];
} 

Additionally, it is advisable to implement handling for cases where the value is empty.

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