diff --git a/dist/index.js b/dist/index.js
index 0635a405..0e60c34e 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -6773,7 +6773,7 @@ var StringLiteralReplacer = StringLiteralReplacer_1 = function (_AbstractReplace
             }
             var indexOfValue = this.stringArrayStorage.getLength();
             var hexadecimalIndex = "" + Utils_1.Utils.hexadecimalPrefix + Utils_1.Utils.decToHex(indexOfValue);
-            this.stringArrayStorage.set(null, value);
+            this.stringArrayStorage.set(this.stringArrayStorage.getLength(), value);
             this.stringLiteralHexadecimalIndexCache.set(value, hexadecimalIndex);
             return hexadecimalIndex;
         }
@@ -7599,6 +7599,8 @@ var RandomGeneratorUtils_1 = __webpack_require__(9);
 var ArrayStorage = function () {
     function ArrayStorage() {
         (0, _classCallCheck3.default)(this, ArrayStorage);
+
+        this.storageLength = 0;
     }
 
     (0, _createClass3.default)(ArrayStorage, [{
@@ -7618,7 +7620,7 @@ var ArrayStorage = function () {
     }, {
         key: "getLength",
         value: function getLength() {
-            return this.storage.length;
+            return this.storageLength;
         }
     }, {
         key: "getStorage",
@@ -7649,14 +7651,19 @@ var ArrayStorage = function () {
     }, {
         key: "set",
         value: function set(key, value) {
-            this.storage.push(value);
+            if (key === this.storageLength) {
+                this.storage.push(value);
+            } else {
+                this.storage.splice(key, 0, value);
+            }
+            this.storageLength++;
         }
     }]);
     return ArrayStorage;
 }();
-tslib_1.__decorate([Initializable_1.initializable(), tslib_1.__metadata("design:type", String)], ArrayStorage.prototype, "storageId", void 0);
 tslib_1.__decorate([Initializable_1.initializable(), tslib_1.__metadata("design:type", Array)], ArrayStorage.prototype, "storage", void 0);
-ArrayStorage = tslib_1.__decorate([inversify_1.injectable(), tslib_1.__metadata("design:paramtypes", [])], ArrayStorage);
+tslib_1.__decorate([Initializable_1.initializable(), tslib_1.__metadata("design:type", String)], ArrayStorage.prototype, "storageId", void 0);
+ArrayStorage = tslib_1.__decorate([inversify_1.injectable()], ArrayStorage);
 exports.ArrayStorage = ArrayStorage;
 
 /***/ }),
diff --git a/package.json b/package.json
index b81dac0b..07fe7b83 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
     "tslint": "4.3.1",
     "tslint-loader": "3.3.0",
     "typescript": "2.1.5",
-    "webpack": "2.2.0-rc.5",
+    "webpack": "2.2.0-rc.6",
     "webpack-node-externals": "1.5.4"
   },
   "repository": {
diff --git a/src/interfaces/storages/IStorage.d.ts b/src/interfaces/storages/IStorage.d.ts
index 5540fb01..f76fab01 100644
--- a/src/interfaces/storages/IStorage.d.ts
+++ b/src/interfaces/storages/IStorage.d.ts
@@ -43,7 +43,7 @@ export interface IStorage <T> extends IInitializable {
      * @param key
      * @param value
      */
-    set (key: string | number | null, value: T): void;
+    set (key: string | number, value: T): void;
 
     /**
      * @returns string
diff --git a/src/node-transformers/obfuscating-transformers/replacers/StringLiteralReplacer.ts b/src/node-transformers/obfuscating-transformers/replacers/StringLiteralReplacer.ts
index 10f5523a..6a540e0b 100644
--- a/src/node-transformers/obfuscating-transformers/replacers/StringLiteralReplacer.ts
+++ b/src/node-transformers/obfuscating-transformers/replacers/StringLiteralReplacer.ts
@@ -105,7 +105,7 @@ export class StringLiteralReplacer extends AbstractReplacer {
         const indexOfValue: number = this.stringArrayStorage.getLength();
         const hexadecimalIndex: string = `${Utils.hexadecimalPrefix}${Utils.decToHex(indexOfValue)}`;
 
-        this.stringArrayStorage.set(null, value);
+        this.stringArrayStorage.set(this.stringArrayStorage.getLength(), value);
         this.stringLiteralHexadecimalIndexCache.set(value, hexadecimalIndex);
 
         return hexadecimalIndex;
diff --git a/src/storages/ArrayStorage.ts b/src/storages/ArrayStorage.ts
index 22cae049..66209d5c 100644
--- a/src/storages/ArrayStorage.ts
+++ b/src/storages/ArrayStorage.ts
@@ -8,6 +8,12 @@ import { RandomGeneratorUtils } from '../utils/RandomGeneratorUtils';
 
 @injectable()
 export abstract class ArrayStorage <T> implements IStorage <T> {
+    /**
+     * @type {T[]}
+     */
+    @initializable()
+    protected storage: T[];
+
     /**
      * @type {string}
      */
@@ -15,10 +21,9 @@ export abstract class ArrayStorage <T> implements IStorage <T> {
     protected storageId: string;
 
     /**
-     * @type {T[]}
+     * @type {number}
      */
-    @initializable()
-    protected storage: T[];
+    private storageLength: number = 0;
 
     /**
      * @param key
@@ -46,7 +51,7 @@ export abstract class ArrayStorage <T> implements IStorage <T> {
      * @returns {number}
      */
     public getLength (): number {
-        return this.storage.length;
+        return this.storageLength;
     }
 
     /**
@@ -87,7 +92,13 @@ export abstract class ArrayStorage <T> implements IStorage <T> {
      * @param key
      * @param value
      */
-    public set (key: string | null, value: T): void {
-        this.storage.push(value);
+    public set (key: number, value: T): void {
+        if (key === this.storageLength) {
+            this.storage.push(value);
+        } else {
+            this.storage.splice(key, 0, value);
+        }
+
+        this.storageLength++;
     }
 }