From 15d8fb957cab6211af8350560e6a055ef0f3d27d Mon Sep 17 00:00:00 2001
From: Safwan Samsudeen <safwansamsudeen.c@gmail.com>
Date: Wed, 4 Feb 2026 20:16:49 +0530
Subject: [PATCH] fix: show error message clearly

---
 frappe/public/js/frappe/views/gantt/gantt_view.js | 12 ++++++++++--
 yarn.lock                                         |  8 ++++----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/frappe/public/js/frappe/views/gantt/gantt_view.js b/frappe/public/js/frappe/views/gantt/gantt_view.js
index b653693d94..249012cc47 100644
--- a/frappe/public/js/frappe/views/gantt/gantt_view.js
+++ b/frappe/public/js/frappe/views/gantt/gantt_view.js
@@ -46,7 +46,7 @@ frappe.views.GanttView = class GanttView extends frappe.views.ListView {
 	prepare_tasks() {
 		var me = this;
 		var meta = this.meta;
-		var field_map = this.calendar_settings.field_map || DEFAULT_FIELD_MAP;
+		let field_map = this.calendar_settings.field_map || DEFAULT_FIELD_MAP;
 
 		this.tasks = this.data.map(function (item) {
 			// set progress
@@ -68,7 +68,15 @@ frappe.views.GanttView = class GanttView extends frappe.views.ListView {
 			} else {
 				label = item["name"];
 			}
-
+			if (!item[field_map.start]) {
+				frappe.msgprint({
+					title: __("Incorrect configuration"),
+					message: __(
+						"Please configure the start field for this Doctype in the controller file."
+					),
+					indicator: "red",
+				});
+			}
 			const r = {
 				start: item[field_map.start],
 				end: item[field_map.end] || item[field_map.start],
diff --git a/yarn.lock b/yarn.lock
index b332bf0de8..ac2b8917db 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1440,10 +1440,10 @@ frappe-datatable@1.19.0:
     lodash "^4.17.5"
     sortablejs "^1.7.0"
 
-frappe-gantt@^0.6.0:
-  version "0.6.1"
-  resolved "https://registry.yarnpkg.com/frappe-gantt/-/frappe-gantt-0.6.1.tgz#57ae0b5f024101fc7cd5ba92f605de97dba9c9a1"
-  integrity sha512-1cSU9vLbwypjzaxnCfnEE03Xr3HlAV2S8dRtjxw62o+amkx1A8bBIFd2jp84mcDdTCM77Ij4LzZBslAKZB8oMg==
+frappe-gantt@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/frappe-gantt/-/frappe-gantt-1.0.4.tgz#efa40ceaa284fcf0ff3d4f9cf93d488d5000e37b"
+  integrity sha512-N94OP9ZiapaG5nzgCeZdxsKP8HD5aLVlH5sEHxSNZQnNKQ4BOn2l46HUD+KIE0LpYIterP7gIrFfkLNRuK0npQ==
 
 frappe-quill-image-resize@^3.0.9:
   version "3.0.9"