From 629271cbe002bd2f2792b12c84a14de0804161ab Mon Sep 17 00:00:00 2001
From: alex-js-ltd <alex.js.ltd@gmail.com>
Date: Wed, 26 Aug 2026 10:47:19 +0100
Subject: [PATCH 1/4] test(react-query): cover falsy errors with throwOnError
 in useQuery

---
 .../src/__tests__/useQuery.test.tsx           | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/packages/react-query/src/__tests__/useQuery.test.tsx b/packages/react-query/src/__tests__/useQuery.test.tsx
index 702d9a3ca4..520e80fc67 100644
--- a/packages/react-query/src/__tests__/useQuery.test.tsx
+++ b/packages/react-query/src/__tests__/useQuery.test.tsx
@@ -2773,6 +2773,35 @@ describe('useQuery', () => {
     consoleMock.mockRestore()
   })
 
+  it('should throw error if queryFn rejects with a falsy error and throwOnError is in use', async () => {
+    const consoleMock = vi
+      .spyOn(console, 'error')
+      .mockImplementation(() => undefined)
+    const key = queryKey()
+
+    function Page() {
+      const { status } = useQuery({
+        queryKey: key,
+        queryFn: () => Promise.reject(),
+        retry: false,
+        throwOnError: true,
+      })
+
+      return <h1>{status}</h1>
+    }
+
+    const rendered = renderWithClient(
+      queryClient,
+      <ErrorBoundary fallbackRender={() => <div>error boundary</div>}>
+        <Page />
+      </ErrorBoundary>,
+    )
+
+    await vi.advanceTimersByTimeAsync(0)
+    expect(rendered.getByText('error boundary')).toBeInTheDocument()
+    consoleMock.mockRestore()
+  })
+
   it('should update with data if we observe no properties and throwOnError', async () => {
     const key = queryKey()
 

From 42235e7b277b11a47b95fc711fd76b3aaaa1914a Mon Sep 17 00:00:00 2001
From: alex-js-ltd <alex.js.ltd@gmail.com>
Date: Wed, 26 Aug 2026 11:06:23 +0100
Subject: [PATCH 2/4] test(react-query): show falsy errors silently skip the
 error boundary

---
 .../src/__tests__/useQueries.test.tsx         | 33 +++++++++++++++++
 .../src/__tests__/useSuspenseQueries.test.tsx | 36 +++++++++++++++++++
 2 files changed, 69 insertions(+)

diff --git a/packages/react-query/src/__tests__/useQueries.test.tsx b/packages/react-query/src/__tests__/useQueries.test.tsx
index ca5e525180..4dceb12c21 100644
--- a/packages/react-query/src/__tests__/useQueries.test.tsx
+++ b/packages/react-query/src/__tests__/useQueries.test.tsx
@@ -273,6 +273,39 @@ describe('useQueries', () => {
     consoleMock.mockRestore()
   })
 
+  it("should throw error if in one of queries' queryFn rejects with a falsy error and throwOnError is in use", async () => {
+    const consoleMock = vi
+      .spyOn(console, 'error')
+      .mockImplementation(() => undefined)
+    const key = queryKey()
+
+    function Page() {
+      useQueries({
+        queries: [
+          {
+            queryKey: key,
+            queryFn: () => Promise.reject(),
+            retry: false,
+            throwOnError: true,
+          },
+        ],
+      })
+
+      return null
+    }
+
+    const rendered = renderWithClient(
+      queryClient,
+      <ErrorBoundary fallbackRender={() => <div>error boundary</div>}>
+        <Page />
+      </ErrorBoundary>,
+    )
+
+    await vi.advanceTimersByTimeAsync(0)
+    expect(rendered.getByText('error boundary')).toBeInTheDocument()
+    consoleMock.mockRestore()
+  })
+
   it('should use provided custom queryClient', async () => {
     const key = queryKey()
     const queryFn = async () => {
diff --git a/packages/react-query/src/__tests__/useSuspenseQueries.test.tsx b/packages/react-query/src/__tests__/useSuspenseQueries.test.tsx
index eef3bdcc13..f8bbb63a98 100644
--- a/packages/react-query/src/__tests__/useSuspenseQueries.test.tsx
+++ b/packages/react-query/src/__tests__/useSuspenseQueries.test.tsx
@@ -577,6 +577,42 @@ describe('useSuspenseQueries', () => {
     expect(rendered.getByText('Data 1')).toBeInTheDocument()
   })
 
+  it('should throw error when a queryFn rejects with a falsy error', async () => {
+    const consoleMock = vi
+      .spyOn(console, 'error')
+      .mockImplementation(() => undefined)
+    const key = queryKey()
+
+    function Page() {
+      const [query] = useSuspenseQueries({
+        queries: [
+          {
+            queryKey: key,
+            queryFn: () => sleep(10).then(() => Promise.reject()),
+            retry: false,
+          },
+        ],
+      })
+
+      return <div>data: {String(query.data)}</div>
+    }
+
+    const rendered = renderWithClient(
+      queryClient,
+      <ErrorBoundary fallbackRender={() => <div>error boundary</div>}>
+        <React.Suspense fallback="loading">
+          <Page />
+        </React.Suspense>
+      </ErrorBoundary>,
+    )
+
+    expect(rendered.getByText('loading')).toBeInTheDocument()
+
+    await act(() => vi.advanceTimersByTimeAsync(10))
+    expect(rendered.getByText('error boundary')).toBeInTheDocument()
+    consoleMock.mockRestore()
+  })
+
   it('should throw error when queryKey changes and new query fails', async () => {
     const consoleMock = vi
       .spyOn(console, 'error')

From eeb2d1805d49d562685a9b4dfa2cfad8cb1bd360 Mon Sep 17 00:00:00 2001
From: alex-js-ltd <alex.js.ltd@gmail.com>
Date: Wed, 26 Aug 2026 12:01:40 +0100
Subject: [PATCH 3/4] fix(react-query): throw falsy errors from useQueries to
 the error boundary

---
 packages/react-query/src/useQueries.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-query/src/useQueries.ts b/packages/react-query/src/useQueries.ts
index 437718a988..5b0a84f436 100644
--- a/packages/react-query/src/useQueries.ts
+++ b/packages/react-query/src/useQueries.ts
@@ -323,7 +323,7 @@ export function useQueries<
     },
   )
 
-  if (firstSingleResultWhichShouldThrow?.error) {
+  if (firstSingleResultWhichShouldThrow) {
     throw firstSingleResultWhichShouldThrow.error
   }
 

From fc00bf49b2618f0b818a02c0233df7f0dacf8eb3 Mon Sep 17 00:00:00 2001
From: alex-js-ltd <alex.js.ltd@gmail.com>
Date: Wed, 26 Aug 2026 12:05:36 +0100
Subject: [PATCH 4/4] chore: add changeset

---
 .changeset/olive-donuts-shave.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/olive-donuts-shave.md

diff --git a/.changeset/olive-donuts-shave.md b/.changeset/olive-donuts-shave.md
new file mode 100644
index 0000000000..66ec68812d
--- /dev/null
+++ b/.changeset/olive-donuts-shave.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/react-query': patch
+---
+
+fix(react-query): throw falsy errors from `useQueries` and `useSuspenseQueries` to the error boundary