added validation to make sure that rowValue is a string

Author: KwonIan

src/utils/table.tsx

@@ -255,11 +255,14 @@ export const initColumns = (columns: Column[], disableRichColumnHeaders?: boolea
       case ColumnFormat.EMAIL:
         c.cell = (row: any) => {
           const rowValue = getRowValueFromSelectorString(c.selector, row);
-          const firstAuthor =
-            //typeof rowValue === 'string' && rowValue.includes(',') ? rowValue.split(',')[0] : '';
-            typeof rowValue === 'string' && rowValue.includes(',')
-              ? rowValue.split(',')[0]
-              : rowValue;
+          if (typeof rowValue === 'string') {
+            const firstAuthor =
+              typeof rowValue === 'string' && rowValue.includes(',')
+                ? rowValue.split(',')[0]
+                : rowValue;
+          } else {
+            const firstAuthor = '';
+          }
           let emailAddressPart = '';
           if (c && c.formatOptions && typeof row[c.formatOptions.emailAddressKey] === 'string') {
             const parts = row[c.formatOptions.emailAddressKey].split(':');