diff --git a/src/caosdb/exceptions.py b/src/caosdb/exceptions.py
index 3aa33dfac5e30dce8d06c24c8c90f27542005063..503f8f5180704be4fe4aa509da5e905616f06d69 100644
--- a/src/caosdb/exceptions.py
+++ b/src/caosdb/exceptions.py
@@ -380,3 +380,7 @@ class AuthorizationException(EntityError):
     Maybe you need more privileges or a user account at all.
 
     """
+
+
+class ContainerError(EntityError):
+    """The container contains one or more entities that caused errors."""