diff --git a/angular-demo/src/app/app-button/app-button.component.ts b/angular-demo/src/app/app-button/app-button.component.ts
index 5fcaac9..26516fe 100644
--- a/angular-demo/src/app/app-button/app-button.component.ts
+++ b/angular-demo/src/app/app-button/app-button.component.ts
@@ -6,6 +6,6 @@ import { Component, Input } from "@angular/core";
   styleUrls: ["./app-button.component.scss"]
 })
 export class AppButton {
-  @Input() outline: boolean;
+  @Input() outline: boolean = false;
   @Input() text: string = "test";
 }
diff --git a/read-excel-file/read-excel-file.js b/read-excel-file/read-excel-file.js
index 57689e4..db205ee 100644
--- a/read-excel-file/read-excel-file.js
+++ b/read-excel-file/read-excel-file.js
@@ -26,7 +26,7 @@ function convertXlsxWorkbookToJavascriptArrays(workbook) {
       const rowData = [];
 
       row.eachCell((cell) => {
-        const cellData = cell.value.formula ? `=${cell.value.formula}` : cell.value;
+        const cellData = cell.formula ? `=${cell.formula}` : cell.value;
         rowData.push(cellData);
       });