Fixes for showing version changes for grid values (#3273)

frappe/public/js/frappe/form/footer/timeline.js

@@ -447,8 +447,9 @@ frappe.ui.form.Timeline = Class.extend({
 				var parts = [], count = 0;
 				data.row_changed.every(function(row) {
 					row[3].every(function(p) {
-						var df = frappe.meta.get_docfield(me.frm.fields_dict[row[0]].grid.doctype,
-							p[0], me.frm.docname);
+						var df = me.frm.fields_dict[row[0]] && 
+							frappe.meta.get_docfield(me.frm.fields_dict[row[0]].grid.doctype, 
+								p[0], me.frm.docname);
 
 						if(df && !df.hidden) {
 							field_display_status = frappe.perm.get_field_display_status(df,