diff --git a/client-api/api_lib/pvcapi_provisioner.py b/client-api/api_lib/pvcapi_provisioner.py
index 261da763..bf9dd45d 100755
--- a/client-api/api_lib/pvcapi_provisioner.py
+++ b/client-api/api_lib/pvcapi_provisioner.py
@@ -663,7 +663,7 @@ def list_profile(limit, is_fuzzy=True):
     close_database(conn, cur)
     return data
 
-def create_profile(name, system_template, network_template, storage_template, userdata, script, arguments=[]):
+def create_profile(name, system_template, network_template, storage_template, userdata, script, arguments=None):
     if list_profile(name, is_fuzzy=False):
         retmsg = { 'message': 'The profile "{}" already exists'.format(name) }
         retcode = 400
@@ -719,7 +719,10 @@ def create_profile(name, system_template, network_template, storage_template, us
         retcode = 400
         return retmsg, retcode
 
-    arguments_formatted = '|'.join(arguments)
+    if arguments is not None and isinstance(arguments, list):
+        arguments_formatted = '|'.join(arguments)
+    else:
+        arguments_formatted = ''
 
     conn, cur = open_database(config)
     try:
diff --git a/client-api/pvc-api.py b/client-api/pvc-api.py
index ef9593e5..6e07d133 100755
--- a/client-api/pvc-api.py
+++ b/client-api/pvc-api.py
@@ -5071,7 +5071,7 @@ class API_Provisioner_Profile_Root(Resource):
             reqargs.get('storage_template', None),
             reqargs.get('userdata', None),
             reqargs.get('script', None),
-            reqargs.get('arg', None)
+            reqargs.get('arg', [])
         )
 api.add_resource(API_Provisioner_Profile_Root, '/provisioner/profile')
 
@@ -5164,7 +5164,7 @@ class API_Provisioner_Profile_Element(Resource):
             reqargs.get('storage_template', None),
             reqargs.get('userdata', None),
             reqargs.get('script', None),
-            reqargs.get('arg', None)
+            reqargs.get('arg', [])
         )
 
     @Authenticator