diff --git a/lib/tools.js b/lib/tools.js
index 7d9e8b6..ec0ad32 100644
--- a/lib/tools.js
+++ b/lib/tools.js
@@ -1,4 +1,4 @@
-const axios = require("axios");
+const axios = require('axios').default;
 
 /**
  * Tests whether the given variable is a real object and not an Array
@@ -6,11 +6,11 @@ const axios = require("axios");
  * @returns {it is Record<string, any>}
  */
 function isObject(it) {
-	// This is necessary because:
-	// typeof null === 'object'
-	// typeof [] === 'object'
-	// [] instanceof Object === true
-	return Object.prototype.toString.call(it) === "[object Object]";
+    // This is necessary because:
+    // typeof null === 'object'
+    // typeof [] === 'object'
+    // [] instanceof Object === true
+    return Object.prototype.toString.call(it) === '[object Object]';
 }
 
 /**
@@ -19,8 +19,8 @@ function isObject(it) {
  * @returns {it is any[]}
  */
 function isArray(it) {
-	if (typeof Array.isArray === "function") return Array.isArray(it);
-	return Object.prototype.toString.call(it) === "[object Array]";
+    if (typeof Array.isArray === 'function') return Array.isArray(it);
+    return Object.prototype.toString.call(it) === '[object Array]';
 }
 
 /**
@@ -31,37 +31,39 @@ function isArray(it) {
  * @returns {Promise<string>}
  */
 async function translateText(text, targetLang, yandexApiKey) {
-	if (targetLang === "en") {
-		return text;
-	}
-	if (yandexApiKey) {
-		return await translateYandex(text, targetLang, yandexApiKey);
-	} else {
-		return await translateGoogle(text, targetLang);
-	}
+    if (targetLang === 'en') {
+        return text;
+    } else if (!text) {
+        return '';
+    }
+    if (yandexApiKey) {
+        return translateYandex(text, targetLang, yandexApiKey);
+    } else {
+        return translateGoogle(text, targetLang);
+    }
 }
 
 /**
  * Translates text with Yandex API
  * @param {string} text The text to translate
  * @param {string} targetLang The target languate
- * @param {string} [apiKey] The yandex API key. You can create one for free at https://translate.yandex.com/developers
+ * @param {string} apiKey The yandex API key. You can create one for free at https://translate.yandex.com/developers
  * @returns {Promise<string>}
  */
 async function translateYandex(text, targetLang, apiKey) {
-	if (targetLang === "zh-cn") {
-		targetLang = "zh";
-	}
-	try {
-		const url = `https://translate.yandex.net/api/v1.5/tr.json/translate?key=${apiKey}&text=${encodeURIComponent(text)}&lang=en-${targetLang}`;
-		const response = await axios({url, timeout: 15000});
-		if (response.data && response.data["text"]) {
-			return response.data["text"][0];
-		}
-		throw new Error("Invalid response for translate request");
-	} catch (e) {
-		throw new Error(`Could not translate to "${targetLang}": ${e}`);
-	}
+    if (targetLang === 'zh-cn') {
+        targetLang = 'zh';
+    }
+    try {
+        const url = `https://translate.yandex.net/api/v1.5/tr.json/translate?key=${apiKey}&text=${encodeURIComponent(text)}&lang=en-${targetLang}`;
+        const response = await axios({url, timeout: 15000});
+        if (response.data && response.data.text && isArray(response.data.text)) {
+            return response.data.text[0];
+        }
+        throw new Error('Invalid response for translate request');
+    } catch (e) {
+        throw new Error(`Could not translate to "${targetLang}": ${e}`);
+    }
 }
 
 /**
@@ -71,21 +73,27 @@ async function translateYandex(text, targetLang, apiKey) {
  * @returns {Promise<string>}
  */
 async function translateGoogle(text, targetLang) {
-	try {
-		const url = `http://translate.googleapis.com/translate_a/single?client=gtx&sl=en&tl=${targetLang}&dt=t&q=${encodeURIComponent(text)}&ie=UTF-8&oe=UTF-8`;
-		const response = await axios({url, timeout: 15000});
-		if (isArray(response.data)) {
-			// we got a valid response
-			return response.data[0][0][0];
-		}
-		throw new Error("Invalid response for translate request");
-	} catch (e) {
-		throw new Error(`Could not translate to "${targetLang}": ${e}`);
-	}
+    try {
+        const url = `http://translate.googleapis.com/translate_a/single?client=gtx&sl=en&tl=${targetLang}&dt=t&q=${encodeURIComponent(text)}&ie=UTF-8&oe=UTF-8`;
+        const response = await axios({url, timeout: 15000});
+        if (isArray(response.data)) {
+            // we got a valid response
+            return response.data[0][0][0];
+        }
+        throw new Error('Invalid response for translate request');
+    } catch (e) {
+        if (e.response && e.response.status === 429) {
+            throw new Error(
+                `Could not translate to "${targetLang}": Rate-limited by Google Translate`
+            );
+        } else {
+            throw new Error(`Could not translate to "${targetLang}": ${e}`);
+        }
+    }
 }
 
 module.exports = {
-	isArray,
-	isObject,
-	translateText
-};
\ No newline at end of file
+    isArray,
+    isObject,
+    translateText
+};