diff --git a/frappe/exceptions.py b/frappe/exceptions.py
index f09583e215..20e858c543 100644
--- a/frappe/exceptions.py
+++ b/frappe/exceptions.py
@@ -244,6 +244,10 @@ class InReadOnlyMode(ValidationError):
 	http_status_code = 503  # temporarily not available
 
 
+class SessionBootFailed(ValidationError):
+	http_status_code = 500
+
+
 class TooManyWritesError(Exception):
 	pass
 
diff --git a/frappe/public/js/frappe/desk.js b/frappe/public/js/frappe/desk.js
index 4a81e8620b..74e1c4f1e7 100644
--- a/frappe/public/js/frappe/desk.js
+++ b/frappe/public/js/frappe/desk.js
@@ -34,15 +34,6 @@ frappe.Application = class Application {
 		frappe.socketio.init();
 		frappe.model.init();
 
-		if (frappe.boot.status === "failed") {
-			frappe.msgprint({
-				message: frappe.boot.error,
-				title: __("Session Start Failed"),
-				indicator: "red",
-			});
-			throw "boot failed";
-		}
-
 		this.load_bootinfo();
 		this.load_user_permissions();
 		this.make_nav_bar();
diff --git a/frappe/www/app.py b/frappe/www/app.py
index a32fef5748..dcb326af36 100644
--- a/frappe/www/app.py
+++ b/frappe/www/app.py
@@ -27,8 +27,7 @@ def get_context(context):
 	try:
 		boot = frappe.sessions.get()
 	except Exception as e:
-		boot = frappe._dict(status="failed", error=str(e))
-		print(frappe.get_traceback())
+		raise frappe.SessionBootFailed from e
 
 	# this needs commit
 	csrf_token = frappe.sessions.get_csrf_token()