diff --git a/admin/warm-cache-1.0.groovy b/admin/warm-cache-1.0.groovy
index 46c34f1..88a8148 100644
--- a/admin/warm-cache-1.0.groovy
+++ b/admin/warm-cache-1.0.groovy
@@ -89,6 +89,9 @@
     def groupsLoaded = 0
 
     for (groupUuid in allGroupsUuids) {
+      if(groupUuid.get().length() == 0) {
+        continue
+      }
       groupIncludeCache.parentGroupsOf(groupUuid)
       def group = groupCache.get(groupUuid)