diff --git a/package.json b/package.json
index 77f46d54..bef9d025 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tablefilter",
-  "version": "0.2.63",
+  "version": "0.2.64",
   "description": "A Javascript library making HTML tables filterable and a bit more",
   "license": "MIT",
   "author": {
diff --git a/src/modules/gridLayout.js b/src/modules/gridLayout.js
index 62e2bd21..9a6180f1 100644
--- a/src/modules/gridLayout.js
+++ b/src/modules/gridLayout.js
@@ -149,6 +149,30 @@ export class GridLayout extends Feature {
          */
         this.tblHasColTag = tag(tf.tbl, 'col').length > 0 ? true : false;
 
+        /**
+         * Main container element
+         * @private
+         */
+        this.tblMainCont = null;
+
+        /**
+         * Table container element
+         * @private
+         */
+        this.tblCont = null;
+
+        /**
+         * Headers' table container element
+         * @private
+         */
+        this.headTblCont = null;
+
+        /**
+         * Headers' table element
+         * @private
+         */
+        this.headTbl = null;
+
         // filters flag at TF level
         tf.fltGrid = this.enableFilters;
     }