Tree Table getting the warning as two children with the same key

[Abuthahir-infocore]

Please help us with the below issue

index.js:1 Warning: Encountered two children with the same key, null. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
<TreeTable value={this.state.items} expandedKeys={this.state.expandedKeys} onToggle={(e) => {this.handleclicktree(e)}}
onRowClick={this.handleclickvalue} className="p-datatable-sm" style={{marginLeft: '2px'}} scrollable
scrollHeight="440px" resizableColumns columnResizeMode="fit" selectionMode="single" >
<Column style={{ width:'9%'}} expander/>
<Column body={this.imageBodyTemplate} style={{ width:'6%'}}/>

Thanks!

[Abuthahir-infocore]

fixed it this problem from our side Thanks

[sam17896]

can you tell me how you fixed this ?