diff --git a/bin/core/ail_2_ail.py b/bin/core/ail_2_ail.py
index 530cfa87..780698fc 100755
--- a/bin/core/ail_2_ail.py
+++ b/bin/core/ail_2_ail.py
@@ -141,7 +141,10 @@ def is_server_client_sync_mode_connected(ail_uuid, sync_mode):
     return res == 1
 
 def is_server_client_connected(ail_uuid):
-    return r_cache.sismember('ail_2_ail:server:all_clients', ail_uuid)
+    try:
+        return r_cache.sismember('ail_2_ail:server:all_clients', ail_uuid)
+    except:
+        return False
 
 def clear_server_connected_clients():
     for ail_uuid in get_server_all_connected_clients():
@@ -398,7 +401,10 @@ def get_all_ail_instance_keys():
     return r_serv_sync.smembers(f'ail:instance:key:all')
 
 def is_allowed_ail_instance_key(key):
-    return r_serv_sync.sismember(f'ail:instance:key:all', key)
+    try:
+        return r_serv_sync.sismember(f'ail:instance:key:all', key)
+    except:
+        return False
 
 def get_ail_instance_key(ail_uuid):
     return r_serv_sync.hget(f'ail:instance:{ail_uuid}', 'api_key')
@@ -427,7 +433,10 @@ def get_ail_instance_all_sync_queue(ail_uuid):
     return r_serv_sync.smembers(f'ail:instance:sync_queue:{ail_uuid}')
 
 def is_ail_instance_queue(ail_uuid, queue_uuid):
-    return r_serv_sync.sismember(f'ail:instance:sync_queue:{ail_uuid}', queue_uuid)
+    try:
+        return r_serv_sync.sismember(f'ail:instance:sync_queue:{ail_uuid}', queue_uuid)
+    except:
+        return False
 
 def exists_ail_instance(ail_uuid):
     return r_serv_sync.exists(f'ail:instance:{ail_uuid}')
@@ -439,7 +448,10 @@ def get_ail_instance_description(ail_uuid):
     return r_serv_sync.hget(f'ail:instance:{ail_uuid}', 'description')
 
 def exists_ail_instance(ail_uuid):
-    return r_serv_sync.sismember('ail:instance:all', ail_uuid)
+    try:
+        return r_serv_sync.sismember('ail:instance:all', ail_uuid)
+    except:
+        return False
 
 def is_ail_instance_push_enabled(ail_uuid):
     res = r_serv_sync.hget(f'ail:instance:{ail_uuid}', 'push')
@@ -935,7 +947,10 @@ def get_all_sync_queue_dict():
     return dict_sync_queues
 
 def is_queue_registred_by_ail_instance(queue_uuid, ail_uuid):
-    return r_serv_sync.sismember(f'ail:instance:sync_queue:{ail_uuid}', queue_uuid)
+    try:
+        return r_serv_sync.sismember(f'ail:instance:sync_queue:{ail_uuid}', queue_uuid)
+    except:
+        return False
 
 def register_ail_to_sync_queue(ail_uuid, queue_uuid):
     is_linked = is_ail_instance_linked_to_sync_queue(ail_uuid)
diff --git a/bin/lib/Investigations.py b/bin/lib/Investigations.py
index 09c84f98..1944d00f 100755
--- a/bin/lib/Investigations.py
+++ b/bin/lib/Investigations.py
@@ -22,6 +22,7 @@ sys.path.append(os.environ['AIL_BIN'])
 ##################################
 # Import Project packages
 ##################################
+from lib import ail_core
 from lib import ConfigLoader
 from lib import Tag
 from lib.exceptions import UpdateInvestigationError
@@ -445,7 +446,7 @@ def api_register_object(json_dict):
     investigation = Investigation(investigation_uuid)
 
     obj_type = json_dict.get('type', '').replace(' ', '')
-    if not exists_obj_type(obj_type):
+    if obj_type not in ail_core.get_all_objects():
         return {"status": "error", "reason": f"Invalid Object Type: {obj_type}"}, 400
 
     subtype = json_dict.get('subtype', '')
diff --git a/bin/lib/objects/Screenshots.py b/bin/lib/objects/Screenshots.py
index 68814ab8..efe3e48b 100755
--- a/bin/lib/objects/Screenshots.py
+++ b/bin/lib/objects/Screenshots.py
@@ -9,6 +9,7 @@ import sys
 from hashlib import sha256
 from io import BytesIO
 from flask import url_for
+from pymisp import MISPObject
 
 sys.path.append(os.environ['AIL_BIN'])
 ##################################
diff --git a/bin/lib/objects/abstract_subtype_object.py b/bin/lib/objects/abstract_subtype_object.py
index c3f33eab..82bb85f6 100755
--- a/bin/lib/objects/abstract_subtype_object.py
+++ b/bin/lib/objects/abstract_subtype_object.py
@@ -72,7 +72,10 @@ class AbstractSubtypeObject(AbstractObject, ABC):
             return last_seen
 
     def get_nb_seen(self):
-        return int(r_object.zscore(f'{self.type}_all:{self.subtype}', self.id))
+        nb = r_object.zscore(f'{self.type}_all:{self.subtype}', self.id)
+        if not nb:
+            nb = 0
+        return int(nb)
 
     # # TODO: CHECK RESULT
     def get_nb_seen_by_date(self, date_day):
diff --git a/var/www/blueprints/import_export.py b/var/www/blueprints/import_export.py
index 314c5e74..2297529f 100644
--- a/var/www/blueprints/import_export.py
+++ b/var/www/blueprints/import_export.py
@@ -25,6 +25,7 @@ from exporter import MISPExporter
 from exporter import TheHiveExporter
 from lib.exceptions import MISPConnectionError
 from lib.objects import ail_objects
+from lib import ail_core
 from lib.Investigations import Investigation
 
 # ============ BLUEPRINT ============
@@ -91,7 +92,7 @@ def import_object_file():
 @login_analyst
 def objects_misp_export():
     user_id = current_user.get_id()
-    object_types = ail_objects.get_all_objects_with_subtypes_tuple()
+    object_types = ail_core.get_all_objects_with_subtypes_tuple()
     to_export = MISPExporter.get_user_misp_objects_to_export(user_id)
     return render_template("export_object.html", object_types=object_types, to_export=to_export)