[Fix] Formatter issue (#4993)

frappe/public/js/frappe/form/grid.js

@@ -508,9 +508,9 @@ frappe.ui.form.Grid = Class.extend({
 					}
 					df.colsize = colsize;
 				}
-				
+
 				// attach formatter on refresh
-				if (df.fieldtype == 'Link' && !df.formatter) {
+				if (df.fieldtype == 'Link' && !df.formatter && frappe.meta.docfield_map[df.parent]) {
 					const docfield = frappe.meta.docfield_map[df.parent][df.fieldname];
 					if (docfield && docfield.formatter) {
 						df.formatter = docfield.formatter;