diff --git a/addons/http_routing/models/ir_http.py b/addons/http_routing/models/ir_http.py
index 0b37ce8c756..9ebec6dca62 100644
--- a/addons/http_routing/models/ir_http.py
+++ b/addons/http_routing/models/ir_http.py
@@ -135,7 +135,7 @@ def unslug_url(s):
 def url_lang(path_or_uri, lang_code=None):
     ''' Given a relative URL, make it absolute and add the required lang or
         remove useless lang.
-        Nothing will be done for absolute URL.
+        Nothing will be done for absolute or invalid URL.
         If there is only one language installed, the lang will not be handled
         unless forced with `lang` parameter.
 
@@ -145,9 +145,13 @@ def url_lang(path_or_uri, lang_code=None):
     Lang = request.env['res.lang']
     location = pycompat.to_text(path_or_uri).strip()
     force_lang = lang_code is not None
-    url = werkzeug.urls.url_parse(location)
+    try:
+        url = werkzeug.urls.url_parse(location)
+    except ValueError:
+        # e.g. Invalid IPv6 URL, `werkzeug.urls.url_parse('http://]')`
+        url = False
     # relative URL with either a path or a force_lang
-    if not url.netloc and not url.scheme and (url.path or force_lang):
+    if url and not url.netloc and not url.scheme and (url.path or force_lang):
         location = werkzeug.urls.url_join(request.httprequest.path, location)
         lang_url_codes = [url_code for _, url_code, *_ in Lang.get_available()]
         lang_code = pycompat.to_text(lang_code or request.context['lang'])
@@ -174,7 +178,7 @@ def url_lang(path_or_uri, lang_code=None):
 
 def url_for(url_from, lang_code=None, no_rewrite=False):
     ''' Return the url with the rewriting applied.
-        Nothing will be done for absolute URL, or short URL from 1 char.
+        Nothing will be done for absolute URL, invalid URL, or short URL from 1 char.
 
         :param url_from: The URL to convert.
         :param lang_code: Must be the lang `code`. It could also be something