diff --git a/djaosdb/base.py b/djaosdb/base.py
index ebdcfeb70f283996d6a7abc971648436e95673a4..3cd97f13e60eccdeff001ba458f93c3d6816404d 100644
--- a/djaosdb/base.py
+++ b/djaosdb/base.py
@@ -62,7 +62,7 @@ class DatabaseWrapper(BaseDatabaseWrapper):
         'GenericObjectIdField': 'objectId',
         'ObjectIdField': 'objectId',
         'EmbeddedField': 'object',
-        'ArrayField': caosdb.LIST,
+        'ArrayField': None,
     }
 
     data_types_suffix = {
diff --git a/djaosdb/caosdb_client.py b/djaosdb/caosdb_client.py
index 789ce2170effacf158c16069dd262b172196b493..7360aafcabf4424d62c8ac0485b043ac68b882bf 100644
--- a/djaosdb/caosdb_client.py
+++ b/djaosdb/caosdb_client.py
@@ -1,5 +1,6 @@
 import abc
 import time
+import json
 from logging import getLogger
 from collections import defaultdict
 import caosdb
@@ -213,9 +214,7 @@ class DefaultCaosDBClientDelegate:
                 for p in e.get_properties():
                     row[p.name] = p.value
                     if isinstance(p.value, list):
-                        if len(p.value):
-                            row[p.name] = p.value[0]
-                        else:
+                        if len(p.value) == 0:
                             row[p.name] = None
                 rows.append(row)
             return rows
@@ -225,10 +224,7 @@ class DefaultCaosDBClientDelegate:
             for i in range(len(row)):
                 val = row[i]
                 if isinstance(val, list):
-                    if len(val):
-                        row[i] = val[0]
-                    else:
-                        row[i] = None
+                    row[i] = json.dumps(val)
         return rows
 
     def find(self, record_type, limit=None, sort=None, skip=None, *args, **kwargs):
diff --git a/djaosdb/sql2mongo/query.py b/djaosdb/sql2mongo/query.py
index 5c3d0408000a873af9b637f0b6579b78427d252f..44eab4cf6270d8092d4ac72b89c8d6280f92546b 100644
--- a/djaosdb/sql2mongo/query.py
+++ b/djaosdb/sql2mongo/query.py
@@ -905,7 +905,7 @@ class Query:
             exe = SQLDecodeError(
                 f'FAILED SQL: {self._sql}\n' 
                 f'Params: {self._params}\n'
-                f'Pymongo error: {e.details}\n'
+                f'CaosDBError: {e.msg}\n'
                 f'Version: {djaosdb.__version__}'
             )
             raise exe from e