diff --git a/npbackup/configuration.py b/npbackup/configuration.py
index 8f08229..7fa6a52 100644
--- a/npbackup/configuration.py
+++ b/npbackup/configuration.py
@@ -138,6 +138,7 @@ empty_config_dict = {
     "conf_version": MAX_CONF_VERSION,
     "audience": None,
     "repos": {
+        # Don't allow repo names to contain dots
         "default": {
             "repo_uri": None,
             "permissions": "full",
@@ -156,6 +157,7 @@ empty_config_dict = {
         },
     },
     "groups": {
+        # Don't allow group names to contain dots
         "default_group": {
             "backup_opts": {
                 "paths": [],
diff --git a/npbackup/gui/config.py b/npbackup/gui/config.py
index 8517f08..8891b27 100644
--- a/npbackup/gui/config.py
+++ b/npbackup/gui/config.py
@@ -155,7 +155,7 @@ def config_gui(full_config: dict, config_file: str):
                     "groups" if values["-OBJECT-TYPE-"] == "group" else "repos"
                 )
                 object_name = values["-OBJECT-NAME-"]
-                if object_name is None or object_name == "":
+                if object_name is None or object_name == "" or "." in object_name:
                     sg.PopupError(
                         _t("config_gui.object_name_cannot_be_empty"), keep_on_top=True
                     )
diff --git a/npbackup/translations/config_gui.en.yml b/npbackup/translations/config_gui.en.yml
index c88d9a2..dad7147 100644
--- a/npbackup/translations/config_gui.en.yml
+++ b/npbackup/translations/config_gui.en.yml
@@ -139,7 +139,7 @@ en:
   repo_already_exists: Repo already exists
   group_already_exists: Group already exists
   cannot_remove_group_inherited_settings: Cannot remove group inherited settings. Please remove directly in group configuration
-  object_name_cannot_be_empty: Object name cannot be empty
+  object_name_cannot_be_empty: Object name cannot be empty and may not contain dots
   object_name_cannot_be_all: Object name cannot be '__all__' which is a reserved name
   cannot_delete_default_repo: Cannot delete default repo
   cannot_delete_default_group: Cannot delete default group
diff --git a/npbackup/translations/config_gui.fr.yml b/npbackup/translations/config_gui.fr.yml
index 81321aa..9e6f9c4 100644
--- a/npbackup/translations/config_gui.fr.yml
+++ b/npbackup/translations/config_gui.fr.yml
@@ -140,7 +140,7 @@ fr:
   repo_already_exists: Dépot déjà existant
   group_already_exists: Groupe déjà existant
   cannot_remove_group_inherited_settings: Impossible de supprimer une option héritée de groupe. Veuillez supprimer l'option directement dans la configuration de groupe
-  object_name_cannot_be_empty: Le nom de l'objet ne peut être vide
+  object_name_cannot_be_empty: Le nom de l'objet ne peut être vide et ne peut contenir de points
   object_name_cannot_be_all: Le nom de l'objet ne peut être '__all__' qui est un nom réservé
   cannot_delete_default_repo: Impossible de supprimer le dépot par défaut
   cannot_delete_default_group: Impossible de supprimer le groupe par défaut