diff --git a/searx/search/checker/__main__.py b/searx/search/checker/__main__.py
index 75b37e6c..0d7d1b8e 100644
--- a/searx/search/checker/__main__.py
+++ b/searx/search/checker/__main__.py
@@ -74,6 +74,7 @@ def run(engine_name_list, verbose):
                 stdout.write(f'    {"found languages":15}: {" ".join(sorted(list(checker.test_results.languages)))}\n')
                 for test_name, logs in checker.test_results.logs.items():
                     for log in logs:
+                        log = map(lambda l: l if isinstance(l, str) else repr(l), log)
                         stdout.write(f'    {test_name:15}: {RED}{" ".join(log)}{RESET_SEQ}\n')
 
 
diff --git a/searx/search/processors/online.py b/searx/search/processors/online.py
index 0ceb0adf..d79edd54 100644
--- a/searx/search/processors/online.py
+++ b/searx/search/processors/online.py
@@ -239,14 +239,14 @@ class OnlineProcessor(EngineProcessor):
                 'test': ['unique_results']
             }
 
-        if getattr(self.engine, 'lang', False):
+        if getattr(self.engine, 'supported_languages', []):
             tests['lang_fr'] = {
                 'matrix': {'query': 'paris', 'lang': 'fr'},
-                'result_container': ['not_empty', ('has_lang', 'fr')],
+                'result_container': ['not_empty', ('has_language', 'fr')],
             }
             tests['lang_en'] = {
                 'matrix': {'query': 'paris', 'lang': 'en'},
-                'result_container': ['not_empty', ('has_lang', 'en')],
+                'result_container': ['not_empty', ('has_language', 'en')],
             }
 
         if getattr(self.engine, 'safesearch', False):