diff --git a/src/excel/excel.service.ts b/src/excel/excel.service.ts
index b5a5399..72bb923 100644
--- a/src/excel/excel.service.ts
+++ b/src/excel/excel.service.ts
@@ -269,7 +269,7 @@ export class ExcelService {
 
           if (!carrera) {
             carrera = queryRunner.manager.create(Carrera, {
-              clave: r.clave,
+              clave: r.clave ?? "",
               carrera: r.nomCarr.slice(0, 100),
             });