From 64db9a59f4501e1c8b129ceebca06b808fc4407b Mon Sep 17 00:00:00 2001
From: Copilot <198982749+Copilot@users.noreply.github.com>
Date: Mon, 5 Jan 2026 23:58:54 +0100
Subject: [PATCH] Fix null context crash in tracking budget mode (#6538)

* Initial plan

* Fix fatal error by adding default values to TrackingBudgetContext

The TrackingBudgetContext was initialized with null, causing a fatal error when components tried to destructure properties like currentMonth. This fix adds proper default values and type definitions, matching the pattern used in EnvelopeBudgetContext.

Co-authored-by: MatissJanis <886567+MatissJanis@users.noreply.github.com>

* Add release notes for issue #6538

Co-authored-by: MatissJanis <886567+MatissJanis@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: MatissJanis <886567+MatissJanis@users.noreply.github.com>
---
 .../budget/tracking/TrackingBudgetContext.tsx | 33 ++++++++++++++-----
 upcoming-release-notes/6538.md                |  6 ++++
 2 files changed, 31 insertions(+), 8 deletions(-)
 create mode 100644 upcoming-release-notes/6538.md

diff --git a/packages/desktop-client/src/components/budget/tracking/TrackingBudgetContext.tsx b/packages/desktop-client/src/components/budget/tracking/TrackingBudgetContext.tsx
index 33666ed258..d6c126455d 100644
--- a/packages/desktop-client/src/components/budget/tracking/TrackingBudgetContext.tsx
+++ b/packages/desktop-client/src/components/budget/tracking/TrackingBudgetContext.tsx
@@ -1,14 +1,31 @@
-// @ts-strict-ignore
 import React, { type ReactNode, createContext, useContext } from 'react';
 
 import * as monthUtils from 'loot-core/shared/months';
 
-const Context = createContext(null);
-
-type TrackingBudgetProviderProps = {
+type TrackingBudgetContextDefinition = {
   summaryCollapsed: boolean;
-  onBudgetAction: (month: string, action: string, arg: unknown) => void;
+  onBudgetAction: (month: string, action: string, arg?: unknown) => void;
   onToggleSummaryCollapse: () => void;
+  currentMonth: string;
+};
+
+const TrackingBudgetContext = createContext<TrackingBudgetContextDefinition>({
+  summaryCollapsed: false,
+  onBudgetAction: () => {
+    throw new Error('Unitialised context method called: onBudgetAction');
+  },
+  onToggleSummaryCollapse: () => {
+    throw new Error(
+      'Unitialised context method called: onToggleSummaryCollapse',
+    );
+  },
+  currentMonth: 'unknown',
+});
+
+type TrackingBudgetProviderProps = Omit<
+  TrackingBudgetContextDefinition,
+  'currentMonth'
+> & {
   children: ReactNode;
 };
 export function TrackingBudgetProvider({
@@ -20,7 +37,7 @@ export function TrackingBudgetProvider({
   const currentMonth = monthUtils.currentMonth();
 
   return (
-    <Context.Provider
+    <TrackingBudgetContext.Provider
       value={{
         currentMonth,
         summaryCollapsed,
@@ -29,10 +46,10 @@ export function TrackingBudgetProvider({
       }}
     >
       {children}
-    </Context.Provider>
+    </TrackingBudgetContext.Provider>
   );
 }
 
 export function useTrackingBudget() {
-  return useContext(Context);
+  return useContext(TrackingBudgetContext);
 }
diff --git a/upcoming-release-notes/6538.md b/upcoming-release-notes/6538.md
new file mode 100644
index 0000000000..80d5757f2e
--- /dev/null
+++ b/upcoming-release-notes/6538.md
@@ -0,0 +1,6 @@
+---
+category: Bugfix
+authors: [copilot]
+---
+
+Fix fatal error on budget page load when using tracking budget type