diff --git a/samples/grids/tree-grid/cell-editing-sample/src/index.ts b/samples/grids/tree-grid/cell-editing-sample/src/index.ts
index e5e2a82c05..241e650bc3 100644
--- a/samples/grids/tree-grid/cell-editing-sample/src/index.ts
+++ b/samples/grids/tree-grid/cell-editing-sample/src/index.ts
@@ -59,7 +59,8 @@ export class Sample {
     public webTreeGridCellEditCellTemplate = (ctx: IgcCellTemplateContext) => {
         let cellValues: any = [];
         let uniqueValues: any = [];
-        for(const i of (this.roleplayTreeGridData as any)){
+        let roleplayData = this.roleplayTreeGridData
+        for (const i of (roleplayData as any)){
             const field: string = ctx.cell.column.field;
             if(uniqueValues.indexOf(i[field]) === -1 )
             {