diff --git a/evennia/utils/dbserialize.py b/evennia/utils/dbserialize.py
index 80203923e8..c08704be0e 100644
--- a/evennia/utils/dbserialize.py
+++ b/evennia/utils/dbserialize.py
@@ -237,10 +237,13 @@ class _SaverList(_SaverMutable, MutableSequence):
         self._data = list()
 
     @_save
-    def __add__(self, otherlist):
+    def __iadd__(self, otherlist):
         self._data = self._data.__add__(otherlist)
         return self._data
 
+    def __add__(self, otherlist):
+        return list(self._data) + otherlist
+
     @_save
     def insert(self, index, value):
         self._data.insert(index, self._convert_mutables(value))