src/app/create-qualification/create-qualification.component.ts

@@ -37,7 +37,12 @@ export class CreateQualificationComponent {
 
     isFieldInvalid(fieldName: string): boolean {
         const field = this.qualificationForm.get(fieldName);
-        return (field?.invalid && (field.dirty || field.touched)) as boolean;
+
+        if (!field) {
+            return false;
+        }
+
+        return field.invalid && (field.dirty || field.touched);
     }
 
     getErrorMessage(fieldName: string): string {