diff --git a/api/js/etemplate/et2_widget_grid.ts b/api/js/etemplate/et2_widget_grid.ts
index 0d379ddb55..44a284572d 100644
--- a/api/js/etemplate/et2_widget_grid.ts
+++ b/api/js/etemplate/et2_widget_grid.ts
@@ -521,7 +521,7 @@ export class et2_grid extends et2_DOMWidget implements et2_IDetachedDOM, et2_IAl
 				// Apply widget's class to td, for backward compatability
 				if (node.getAttribute("class"))
 				{
-					let widget_class = this.getArrayMgr("content").expandName(node.getAttribute("class"))
+					let widget_class = (this.getArrayMgr("content").expandName(node.getAttribute("class")) || "")
 						// Do not pass et2_required into parent cell, it looks bad
 						.replace("et2_required", "")
 					cell.class += (cell.class ? " " : "") + widget_class;