diff --git a/src/app/components/qualifikation-form/qualifikation-form.component.ts b/src/app/components/qualifikation-form/qualifikation-form.component.ts
index aad7492..03c1353 100644
--- a/src/app/components/qualifikation-form/qualifikation-form.component.ts
+++ b/src/app/components/qualifikation-form/qualifikation-form.component.ts
@@ -55,6 +55,9 @@ export class QualifikationFormComponent {
 
   addEmployee() {
     const employeeId = Number(this.skillForm.get("newEmployee")?.value);
+    if (!employeeId) {
+      return;
+    }
     const employee = this.addableEmployees.find(emp => emp.id === employeeId);
 
     if (employee) {