diff --git a/openpype/hosts/maya/plugins/publish/collect_arnold_scene_source.py b/openpype/hosts/maya/plugins/publish/collect_arnold_scene_source.py
index d93811c23e..69a07b4aaf 100644
--- a/openpype/hosts/maya/plugins/publish/collect_arnold_scene_source.py
+++ b/openpype/hosts/maya/plugins/publish/collect_arnold_scene_source.py
@@ -23,19 +23,9 @@ class CollectArnoldSceneSource(pyblish.api.InstancePlugin):
                 self.log.warning("Skipped empty instance: \"%s\" " % objset)
                 continue
             if objset.endswith("content_SET"):
-                children = get_all_children(members)
-                instance.data["contentMembers"] = children + members
-                self.log.debug(
-                    "content members: {}".format(
-                        instance.data["contentMembers"]
-                    )
-                )
-            elif objset.endswith("proxy_SET"):
-                children = get_all_children(cmds.ls(members, long=True))
-                instance.data["proxy"] = children + members
-                self.log.debug(
-                    "proxy members: {}".format(instance.data["proxy"])
-                )
+                instance.data["contentMembers"] = self.get_hierarchy(members)
+            if objset.endswith("content_SET"):
+                instance.data["proxy"] = self.get_hierarchy(members)
 
         # Use camera in object set if present else default to render globals
         # camera.
@@ -54,3 +44,13 @@ class CollectArnoldSceneSource(pyblish.api.InstancePlugin):
             self.log.debug("No renderable cameras found.")
 
         self.log.debug("data: {}".format(instance.data))
+
+    def get_hierarchy(self, nodes):
+        """Return nodes with all their children"""
+        nodes = cmds.ls(nodes, long=True)
+        if not nodes:
+            return []
+        children = get_all_children(nodes)
+        # Make sure nodes merged with children only
+        # contains unique entries
+        return list(set(nodes + children))