diff --git a/Kitodo/src/main/java/org/kitodo/production/services/data/ProjectService.java b/Kitodo/src/main/java/org/kitodo/production/services/data/ProjectService.java
index 413379b7312..32b2907a0d3 100644
--- a/Kitodo/src/main/java/org/kitodo/production/services/data/ProjectService.java
+++ b/Kitodo/src/main/java/org/kitodo/production/services/data/ProjectService.java
@@ -368,6 +368,10 @@ public static void delete(int projectID) throws DAOException, DataException, Pro
             user.getProjects().remove(project);
             ServiceManager.getUserService().saveToDatabase(user);
         }
+        for (Template template : project.getTemplates()) {
+            template.getProjects().remove(project);
+            ServiceManager.getTemplateService().saveToDatabase(template);
+        }
         ServiceManager.getProjectService().remove(project);
     }
 }