diff --git a/src/main/java/de/ph87/data/plot/PlotService.java b/src/main/java/de/ph87/data/plot/PlotService.java
index ba1f257..ed03287 100644
--- a/src/main/java/de/ph87/data/plot/PlotService.java
+++ b/src/main/java/de/ph87/data/plot/PlotService.java
@@ -57,6 +57,7 @@ public class PlotService {
     return plotRepository.findMaxPosition().orElse(-1) + 1;
   }
 
+  @NonNull
   @Transactional
   public PlotDto delete(final long id) {
     final Plot plot = getById(id);