issues if initialValue is equal to undefind return null value is not requierd

src/wsjfSettings.tsx

@@ -83,12 +83,13 @@ export class Settings {
 
     private getNumeralComboOptions(id, source: number[], initialValue: number):IComboOptions {
         var that = this;
+        const currentInitialValue = initialValue ? initialValue?.toString(): null
         return {
             id: id,
             mode: "drop",
             source: source,
             enabled: true,
-            value: initialValue.toString(),
+            value: currentInitialValue,
             change: function () {
                 that._changeMade = true;
                 let num: number = +(this.getText());