diff --git a/www/common/onlyoffice/inner.js b/www/common/onlyoffice/inner.js
index 21e7d0cd4..2f0c52ee1 100644
--- a/www/common/onlyoffice/inner.js
+++ b/www/common/onlyoffice/inner.js
@@ -2171,46 +2171,51 @@ define([
                 }
 
                 //Ensure spellcheck set correctly (works only with localized language variants)
-                var defaultLanguageCode = getEditor().asc_getDefaultLanguage();
+                var editor = getEditor();
+                if (typeof editor.asc_getDefaultLanguage === 'function' && typeof editor.asc_setDefaultLanguage === 'function') {
 
-                const langToLocale = {
-                    "en" : "en-us",
-                    "fr" : "fr-fr",
-                    "es" : "es-es",
-                    "de" : "de-de"
-                };
+                    var defaultLanguageCode = editor.asc_getDefaultLanguage();
 
-                const langCodeToLocale = {
-                    7: "de-de",
-                    9: "en-us",
-                    10: "es-es",
-                    12: "fr-fr"
-                };
+                    const langToLocale = {
+                        "en" : "en-us",
+                        "fr" : "fr-fr",
+                        "es" : "es-es",
+                        "de" : "de-de"
+                    };
 
-                const localeToLCID = Object.fromEntries(
-                    Object.values(window.frames[0].AscCommon.g_aCultureInfos)
-                        .map(info => [info.Name.toLowerCase(), info.LCID])
-                );
+                    const langCodeToLocale = {
+                        7: "de-de",
+                        9: "en-us",
+                        10: "es-es",
+                        12: "fr-fr"
+                    };
 
-                if (APP.startNew) {
-                    var w = getWindow();
-                    //If default language variant is generic - localize it
-                    if (Object.keys(langToLocale).includes(lang)) {
-                        lang = langToLocale[lang];
+                    const localeToLCID = Object.fromEntries(
+                        Object.values(window.frames[0].AscCommon.g_aCultureInfos)
+                            .map(info => [info.Name.toLowerCase(), info.LCID])
+                    );
+
+                    if (APP.startNew) {
+                        var w = getWindow();
+                        //If default language variant is generic - localize it
+                        if (Object.keys(langToLocale).includes(lang)) {
+                            lang = langToLocale[lang];
+                        }
+                        var l = w.Common.util.LanguageInfo.getLocalLanguageCode(lang);
+                        editor.asc_setDefaultLanguage(l);
+
+                    } else {
+                        //Setting the language every time document loads prevents spellcheck from 'switching off'
+                        var localeLang = langCodeToLocale[defaultLanguageCode];
+
+                        //If default language variant is generic - localize it
+                        if (defaultLanguageCode < 1000 && localeLang) {
+                            defaultLanguageCode = localeToLCID[localeLang];
+                        }
+                        editor.asc_setDefaultLanguage(defaultLanguageCode);
                     }
-                    var l = w.Common.util.LanguageInfo.getLocalLanguageCode(lang);
-                    getEditor().asc_setDefaultLanguage(l);
-
-                } else {
-                    //Setting the language every time document loads prevents spellcheck from 'switching off'
-                    var localeLang = langCodeToLocale[defaultLanguageCode];
-
-                    //If default language variant is generic - localize it
-                    if (defaultLanguageCode < 1000 && localeLang) {
-                        defaultLanguageCode = localeToLCID[localeLang];
-                    }
-                    getEditor().asc_setDefaultLanguage(defaultLanguageCode);
                 }
+
             }
 
             sframeChan.event('EV_OO_DOC_READY');