diff --git a/repository/src/main/java/org/orderofthebee/addons/support/tools/repo/jsconsole/AlfrescoScriptAPITernGet.java b/repository/src/main/java/org/orderofthebee/addons/support/tools/repo/jsconsole/AlfrescoScriptAPITernGet.java
index aa3c6173..0ccfbb88 100644
--- a/repository/src/main/java/org/orderofthebee/addons/support/tools/repo/jsconsole/AlfrescoScriptAPITernGet.java
+++ b/repository/src/main/java/org/orderofthebee/addons/support/tools/repo/jsconsole/AlfrescoScriptAPITernGet.java
@@ -1312,7 +1312,8 @@ protected Collection<QName> collectTaskAspects(final Collection<QName> taskTypes
         while (taskAspectsChanged)
         {
             taskAspectsChanged = false;
-            for (final QName taskAspect : taskAspects)
+            // shallow copy to avoid concurrent modification
+            for (final QName taskAspect : new ArrayList<>(taskAspects))
             {
                 final AspectDefinition aspect = this.dictionaryService.getAspect(taskAspect);
                 taskAspectsChanged = taskAspects.addAll(aspect.getDefaultAspectNames()) || taskAspectsChanged;