diff --git a/src/translate.parser.ts b/src/translate.parser.ts
index fbae1a23..040d5729 100644
--- a/src/translate.parser.ts
+++ b/src/translate.parser.ts
@@ -32,7 +32,7 @@ export class Parser {
         key = '';
         do {
             key += keys.shift();
-            if (target[key] !== undefined && (typeof target[key] === 'object' || !keys.length)) {
+            if (target!==undefined && target[key] !== undefined && (typeof target[key] === 'object' || !keys.length)) {
                 target = target[key];
                 key = '';
             } else if (!keys.length) {