Skip rendering when node is offscreen

treegrid.js

@@ -6,7 +6,7 @@
  * - dynamic loading of child nodes
  *
  * License: MPL 2.0+, (c) Vitaliy Filippov 2016+
- * Version: 2017-07-12
+ * Version: 2017-07-13
  */
 
 /**
@@ -1252,6 +1252,11 @@ TreeGridNode.prototype._renderCell = function(rowIndex, colIndex, cell, force)
 
 TreeGridNode.prototype.render = function(colidx, rowidx, force, skipSync)
 {
+    if (!this.tr)
+    {
+        // Node is not visible, skip rendering
+        return false;
+    }
     var cells = this.grid.renderer(this, colidx, rowidx);
     if (this.tr.length == 1)
         cells = [ cells ];