diff --git a/quartz-manager-parent/quartz-manager-starter-api/src/main/java/it/fabioformosa/quartzmanager/api/services/JobService.java b/quartz-manager-parent/quartz-manager-starter-api/src/main/java/it/fabioformosa/quartzmanager/api/services/JobService.java
index dc58a7e..d9df80d 100644
--- a/quartz-manager-parent/quartz-manager-starter-api/src/main/java/it/fabioformosa/quartzmanager/api/services/JobService.java
+++ b/quartz-manager-parent/quartz-manager-starter-api/src/main/java/it/fabioformosa/quartzmanager/api/services/JobService.java
@@ -22,7 +22,8 @@ public class JobService {
   private List<String> jobClassPackages = new ArrayList<>();
 
   public JobService(@Value("${quartz-manager.jobClassPackages}") String jobClassPackages) {
-    List<String> splitPackages = Arrays.stream(Optional.of(jobClassPackages).map(str -> str.split(",")).get())
+    List<String> splitPackages = Arrays.stream(Optional.of(jobClassPackages).map(str -> str.split(","))
+        .orElseThrow(() -> new RuntimeException("The prop quartz-manager.jobClassPackages  cannot be blank!")))
       .map(String::trim)
       .filter(StringUtils::isNotBlank)
       .collect(Collectors.toList());