diff --git a/cura/Settings/ContainerManager.py b/cura/Settings/ContainerManager.py
index f910f0c0e2..345c25ded9 100644
--- a/cura/Settings/ContainerManager.py
+++ b/cura/Settings/ContainerManager.py
@@ -389,8 +389,6 @@ class ContainerManager(QObject):
         return ContainerManager.getInstance()
 
     def _performMerge(self, merge_into, merge, clear_settings = True):
-        assert isinstance(merge, type(merge_into))
-
         if merge == merge_into:
             return