searx/data/engines_languages.json stores language information for several searchengines in a json endoded dict that maps engine-"types" to their supported languages; for instance there is an entry "google", mapping to the supported languages of the google engine. However, the lookup code did not use the engine 'type' (as in: the filename searx/engines/<enginetype>.py), but instead the manually configured engine name from settings.yml when querying. This is problematic as soon as users start to specify additional engine instances with custom names in the config file, as for instance suggested as a workaround for multilingual search in the manual[0]: > engines: > - name : google english > engine : google > language : english Here, the engine name "google english" will be used for the lookup in the json file, which does not exist. The empty supported_languages then lead to a type error later in the processing callchain. This patch changes the behaviour to use the engine's entry-"type" ("google" in the above example) for the lookup. This should fix bug #2928. 0: https://searx.github.io/searx/user/search_syntax.html#multilingual-search