diff --git a/.changeset/query-devtools-missing-state.md b/.changeset/query-devtools-missing-state.md
new file mode 100644
index 00000000000..b50b9bdf7ab
--- /dev/null
+++ b/.changeset/query-devtools-missing-state.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/query-devtools': patch
+---
+
+Avoid crashing devtools query rows when a cached query state is temporarily unavailable.
diff --git a/.changeset/stable-devtools-query-rows.md b/.changeset/stable-devtools-query-rows.md
new file mode 100644
index 00000000000..d58a0a9dbc0
--- /dev/null
+++ b/.changeset/stable-devtools-query-rows.md
@@ -0,0 +1,5 @@
+---
+"@tanstack/query-devtools": patch
+---
+
+Resolve devtools query rows from their stable query hash so mutated object query keys do not break row rendering.
diff --git a/packages/query-devtools/src/Devtools.tsx b/packages/query-devtools/src/Devtools.tsx
index 8e9b1f4a321..dfb66e496a7 100644
--- a/packages/query-devtools/src/Devtools.tsx
+++ b/packages/query-devtools/src/Devtools.tsx
@@ -1384,61 +1384,41 @@ const QueryRow: Component<{ query: Query }> = (props) => {
   const t = (light: string, dark: string) => (theme() === 'dark' ? dark : light)
 
   const queryState = createSubscribeToQueryCacheBatcher(
-    (queryCache) =>
-      queryCache().find({
-        queryKey: props.query.queryKey,
-      })?.state,
+    (queryCache) => queryCache().get(props.query.queryHash)?.state,
     true,
     (e) => e.query.queryHash === props.query.queryHash,
   )
 
   const isDisabled = createSubscribeToQueryCacheBatcher(
     (queryCache) =>
-      queryCache()
-        .find({
-          queryKey: props.query.queryKey,
-        })
-        ?.isDisabled() ?? false,
+      queryCache().get(props.query.queryHash)?.isDisabled() ?? false,
     true,
     (e) => e.query.queryHash === props.query.queryHash,
   )
 
   const isStatic = createSubscribeToQueryCacheBatcher(
     (queryCache) =>
-      queryCache()
-        .find({
-          queryKey: props.query.queryKey,
-        })
-        ?.isStatic() ?? false,
+      queryCache().get(props.query.queryHash)?.isStatic() ?? false,
     true,
     (e) => e.query.queryHash === props.query.queryHash,
   )
 
   const isStale = createSubscribeToQueryCacheBatcher(
-    (queryCache) =>
-      queryCache()
-        .find({
-          queryKey: props.query.queryKey,
-        })
-        ?.isStale() ?? false,
+    (queryCache) => queryCache().get(props.query.queryHash)?.isStale() ?? false,
     true,
     (e) => e.query.queryHash === props.query.queryHash,
   )
 
   const observers = createSubscribeToQueryCacheBatcher(
     (queryCache) =>
-      queryCache()
-        .find({
-          queryKey: props.query.queryKey,
-        })
-        ?.getObserversCount() ?? 0,
+      queryCache().get(props.query.queryHash)?.getObserversCount() ?? 0,
     true,
     (e) => e.query.queryHash === props.query.queryHash,
   )
 
   const color = createMemo(() =>
     getQueryStatusColor({
-      queryState: queryState()!,
+      queryState: queryState(),
       observerCount: observers(),
       isStale: isStale(),
     }),
diff --git a/packages/query-devtools/src/__tests__/Devtools.test.tsx b/packages/query-devtools/src/__tests__/Devtools.test.tsx
index 066f71268ab..864698429c1 100644
--- a/packages/query-devtools/src/__tests__/Devtools.test.tsx
+++ b/packages/query-devtools/src/__tests__/Devtools.test.tsx
@@ -390,6 +390,18 @@ describe('Devtools', () => {
       expect(rendered.getByText('static')).toBeInTheDocument()
       expect(rendered.getByLabelText(/, static/)).toBeInTheDocument()
     })
+
+    it('should render a query row when an object query key is mutated in place', () => {
+      const filters = { page: 1 }
+      queryClient.setQueryData(['mutable-key', filters], 'x')
+      filters.page = 2
+
+      const rendered = renderDevtools({ initialIsOpen: true })
+
+      expect(
+        rendered.getByLabelText(/Query key \["mutable-key",\{"page":1\}\]/),
+      ).toBeInTheDocument()
+    })
   })
 
   describe('picture-in-picture', () => {
diff --git a/packages/query-devtools/src/__tests__/Explorer.test.tsx b/packages/query-devtools/src/__tests__/Explorer.test.tsx
index fb329a98db3..9a4940b1c60 100644
--- a/packages/query-devtools/src/__tests__/Explorer.test.tsx
+++ b/packages/query-devtools/src/__tests__/Explorer.test.tsx
@@ -28,7 +28,11 @@ describe('Explorer', () => {
     queryClient.clear()
   })
 
-  function renderExplorer(props: Parameters<typeof Explorer>[0]) {
+  function renderExplorer(
+    props: Parameters<typeof Explorer>[0],
+    options: { theme?: 'dark' | 'light' } = {},
+  ) {
+    const theme = options.theme ?? 'dark'
     return render(() => (
       <QueryDevtoolsContext.Provider
         value={{
@@ -38,7 +42,7 @@ describe('Explorer', () => {
           onlineManager,
         }}
       >
-        <ThemeContext.Provider value={() => 'dark'}>
+        <ThemeContext.Provider value={() => theme}>
           <Explorer {...props} />
         </ThemeContext.Provider>
       </QueryDevtoolsContext.Provider>
@@ -562,4 +566,26 @@ describe('Explorer', () => {
       expect(queryClient.getQueryData(['data'])).toEqual({})
     })
   })
+
+  describe('theme', () => {
+    it('should render without throwing under the "light" theme', () => {
+      const value = { items: ['a'], flag: true }
+      queryClient.setQueryData(['data'], value)
+
+      expect(() =>
+        renderExplorer(
+          {
+            label: 'Data',
+            value,
+            defaultExpanded: ['Data'],
+            editable: true,
+            activeQuery: queryClient
+              .getQueryCache()
+              .find({ queryKey: ['data'] }) as Query,
+          },
+          { theme: 'light' },
+        ),
+      ).not.toThrow()
+    })
+  })
 })
diff --git a/packages/query-devtools/src/__tests__/utils.test.ts b/packages/query-devtools/src/__tests__/utils.test.ts
index 07dff9ece4d..511553e2bb8 100644
--- a/packages/query-devtools/src/__tests__/utils.test.ts
+++ b/packages/query-devtools/src/__tests__/utils.test.ts
@@ -1573,6 +1573,16 @@ describe('Utils tests', () => {
       ).toBe('gray')
     })
 
+    it('should return "gray" when the query state is unavailable', () => {
+      expect(
+        getQueryStatusColor({
+          queryState: undefined,
+          observerCount: 0,
+          isStale: false,
+        }),
+      ).toBe('gray')
+    })
+
     it('should return "purple" when fetchStatus is "paused"', () => {
       expect(
         getQueryStatusColor({
diff --git a/packages/query-devtools/src/utils.tsx b/packages/query-devtools/src/utils.tsx
index 9a826cd21e3..5306f2cf5f2 100644
--- a/packages/query-devtools/src/utils.tsx
+++ b/packages/query-devtools/src/utils.tsx
@@ -31,15 +31,15 @@ export function getQueryStatusColor({
   observerCount,
   isStale,
 }: {
-  queryState: Query['state']
+  queryState: Query['state'] | undefined
   observerCount: number
   isStale: boolean
 }) {
-  return queryState.fetchStatus === 'fetching'
+  return queryState?.fetchStatus === 'fetching'
     ? 'blue'
     : !observerCount
       ? 'gray'
-      : queryState.fetchStatus === 'paused'
+      : queryState?.fetchStatus === 'paused'
         ? 'purple'
         : isStale
           ? 'yellow'