diff --git a/node_modules/typo-js/typo.js b/node_modules/typo-js/typo.js
index 68c285b..95ebc6c 100644
--- a/node_modules/typo-js/typo.js
+++ b/node_modules/typo-js/typo.js
@@ -431,7 +431,7 @@ Typo.prototype = {
 				dictionaryTable[word] = null;
 			}
 			
-			if (rules.length > 0) {
+			if (rules && rules.length > 0) {
 				if (dictionaryTable[word] === null) {
 					dictionaryTable[word] = [];
 				}
@@ -546,6 +546,7 @@ Typo.prototype = {
 		else if (this.flags.FLAG === "num") {
 			return textCodes.split(",");
 		}
+		return [];
 	},
 	
 	/**