diff --git a/bin/lib/ail_core.py b/bin/lib/ail_core.py
index c3277b96..344449eb 100755
--- a/bin/lib/ail_core.py
+++ b/bin/lib/ail_core.py
@@ -89,7 +89,7 @@ def get_object_all_subtypes(obj_type):  # TODO Dynamic subtype
     if obj_type == 'pgp':
         return ['key', 'mail', 'name']
     if obj_type == 'username':
-        return ['telegram', 'twitter', 'jabber']
+        return ['telegram', 'discord', 'twitter', 'jabber']
     if obj_type == 'user-account':
         return r_object.smembers(f'all_chat:subtypes')
     return []
diff --git a/bin/lib/objects/abstract_subtype_object.py b/bin/lib/objects/abstract_subtype_object.py
index 9598feec..80d132e8 100755
--- a/bin/lib/objects/abstract_subtype_object.py
+++ b/bin/lib/objects/abstract_subtype_object.py
@@ -22,6 +22,7 @@
 from lib.ConfigLoader import ConfigLoader
 from lib.item_basic import is_crawled, get_item_domain
 from lib.data_retention_engine import update_obj_date
+from lib.telegram import USERNAME_CHARS
 
 from packages import Date
 
@@ -254,6 +255,15 @@ def get_metas(self, subtype, obj_ids, options=set()):
             dict_obj[obj_id] = obj.get_meta(options=options)
         return dict_obj
 
+    def is_valid_search(self, subtypes, id_to_search):
+        if subtypes == 'telegram':
+            return set(id_to_search).issubset(USERNAME_CHARS)
+        elif subtypes == 'discord':
+            id_to_search = id_to_search.replace('.', '').replace('#', '')
+            return set(id_to_search).issubset(USERNAME_CHARS)
+        else:
+            return True
+
     @abstractmethod
     def sanitize_id_to_search(self, subtypes, id_to_search):
         return id_to_search
diff --git a/bin/lib/telegram.py b/bin/lib/telegram.py
index 02984066..ba687cc8 100755
--- a/bin/lib/telegram.py
+++ b/bin/lib/telegram.py
@@ -19,6 +19,7 @@
 
 REGEX_USERNAME = re.compile(r'[0-9a-zA-z_]+')
 REGEX_JOIN_HASH = re.compile(r'[0-9a-zA-z-]+')
+USERNAME_CHARS = set("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_")
 
 ##  ##
 
diff --git a/var/www/blueprints/objects_subtypes.py b/var/www/blueprints/objects_subtypes.py
index 01536d7d..ec22cb9e 100644
--- a/var/www/blueprints/objects_subtypes.py
+++ b/var/www/blueprints/objects_subtypes.py
@@ -151,6 +151,9 @@ def objects_username_search():
             page = 1
 
         usernames = Usernames.Usernames()
+        if not usernames.is_valid_search(subtype, to_search):
+            return create_json_response({'status': 'error', 'message': 'Invalid Username'}, 400)
+
         search_result = usernames.search_by_id(to_search, [subtype], page, case_sensitive=case_sensitive)
 
         if search_result: