diff --git a/src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantsDiagramService.java b/src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantsDiagramService.java
index 64a2d33e..6a15464d 100644
--- a/src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantsDiagramService.java
+++ b/src/main/java/net/hostsharing/hsadminng/rbac/grant/RbacGrantsDiagramService.java
@@ -94,12 +94,14 @@ public class RbacGrantsDiagramService {
     }
 
     public String allGrantsFrom(final UUID targetObject, final String op, final EnumSet<Include> includes) {
-        final var refUuid = (UUID) em.createNativeQuery("SELECT uuid FROM rbac.permission WHERE objectuuid=:targetObject AND op=:op")
+        final var graph = new LimitedHashSet<RawRbacGrantEntity>();
+
+        @SuppressWarnings("unchecked")
+        final var refUuids = (List<UUID>) em.createNativeQuery("SELECT uuid FROM rbac.permission WHERE objectuuid=:targetObject AND op=:op", List.class)
                 .setParameter("targetObject", targetObject)
                 .setParameter("op", op)
-                .getSingleResult();
-        final var graph = new LimitedHashSet<RawRbacGrantEntity>();
-        traverseGrantsFrom(graph, refUuid, includes);
+                .getResultList();
+        refUuids.forEach(refUuid -> traverseGrantsFrom(graph, refUuid, includes));
         return toMermaidFlowchart(graph, includes);
     }