diff --git a/erpnext/venue/doctype/event_registration/event_registration.py b/erpnext/venue/doctype/event_registration/event_registration.py
index 0acb83bf7dff90b357e078b1beef1eb3cbcaa8e7..32518b04753ccfdbf2991295bd8ec3f045a87eb0 100644
--- a/erpnext/venue/doctype/event_registration/event_registration.py
+++ b/erpnext/venue/doctype/event_registration/event_registration.py
@@ -6,6 +6,7 @@ from functools import cached_property
 import frappe
 from frappe import _
 from frappe.model.document import Document
+from frappe.utils import is_desk
 
 from erpnext.utilities import webshop_app_import_guard
 
@@ -17,16 +18,6 @@ def _get_shopping_cart_settings():
 	return get_shopping_cart_settings()
 
 
-def is_desk() -> bool:
-	try:
-		path = frappe.request.path
-		if path.startswith("/app/") or path.startswith("/api/"):
-			return True
-	except Exception:
-		pass
-	return False
-
-
 class DuplicateRegistration(frappe.ValidationError):
 	"""Raised when a duplicate registration is found for the same user (or email address if user is missing)."""
 
diff --git a/erpnext/venue/doctype/item_booking/item_booking.py b/erpnext/venue/doctype/item_booking/item_booking.py
index a94fb362e3f578bed6a479034097717d880ea9df..d78f2f9667fcddc21de4060857f7a91deea34df3 100644
--- a/erpnext/venue/doctype/item_booking/item_booking.py
+++ b/erpnext/venue/doctype/item_booking/item_booking.py
@@ -27,6 +27,7 @@ from frappe.utils import (
 	get_datetime,
 	get_time,
 	getdate,
+	is_desk,
 	now,
 	now_datetime,
 	sbool,
@@ -84,14 +85,6 @@ def util_split_list(
 	return items_no, items_yes
 
 
-def is_desk() -> bool:
-	try:
-		return bool(frappe.request.path.startswith("/app/") or frappe.request.path.startswith("/api/"))
-	except Exception:
-		pass
-	return False
-
-
 class BookingException(frappe.ValidationError):
 	@classmethod
 	def throw(cls, *args, **kwargs):
@@ -145,7 +138,7 @@ class ExceptionBookingOverlap(BookingException):
 class ExceptionTooManyBookings(ExceptionBookingOverlap):
 	@classmethod
 	def throw_website(cls, doc: "ItemBooking", overlaps: list):
-		cls.throw_desk(doc, overlaps)
+		frappe.throw(_("This slot is no longer bookable."), exc=cls)
 
 	@classmethod
 	def throw_desk(cls, doc: "ItemBooking", overlaps: list):
@@ -703,7 +696,9 @@ def get_item_uoms(item_code):
 @frappe.whitelist()
 @deprecated
 def book_new_slot(**kwargs):
-	frappe.log_error("book_new_slot is deprecated: use webshop.webshop.shopping_cart.booking.book_new_slot instead")
+	frappe.log_error(
+		"book_new_slot is deprecated: use webshop.webshop.shopping_cart.booking.book_new_slot instead"
+	)
 	try:
 		doc = frappe.get_doc(
 			{
@@ -732,19 +727,21 @@ def book_new_slot(**kwargs):
 def book_new_slot_from_event(**kwargs):
 	frappe.only_for("Desk User")
 	doc = frappe.new_doc("Item Booking")
-	doc.update({
-		"item": kwargs.get("item"),
-		"starts_on": kwargs.get("start"),
-		"ends_on": kwargs.get("end"),
-		"user": kwargs.get("user"),
-		"status": kwargs.get("status") or "In cart",
-		"event": kwargs.get("event"),
-		"all_day": kwargs.get("all_day") or 0,
-		"uom": kwargs.get("uom"),
-		"sync_with_google_calendar": kwargs.get("sync_with_google_calendar")
-		or frappe.db.get_single_value("Venue Settings", "sync_with_google_calendar"),
-		"deduct_booking_credits": sbool(kwargs.get("with_credits")),
-	})
+	doc.update(
+		{
+			"item": kwargs.get("item"),
+			"starts_on": kwargs.get("start"),
+			"ends_on": kwargs.get("end"),
+			"user": kwargs.get("user"),
+			"status": kwargs.get("status") or "In cart",
+			"event": kwargs.get("event"),
+			"all_day": kwargs.get("all_day") or 0,
+			"uom": kwargs.get("uom"),
+			"sync_with_google_calendar": kwargs.get("sync_with_google_calendar")
+			or frappe.db.get_single_value("Venue Settings", "sync_with_google_calendar"),
+			"deduct_booking_credits": sbool(kwargs.get("with_credits")),
+		}
+	)
 	doc.insert(ignore_permissions=True)
 	return doc