@@ -160,7 +160,8 @@ export function applyDirectoryEvent(input: {
     }
     case "session.diff": {
       const props = event.properties as { sessionID: string; diff: FileDiff[] }
-      input.setStore("session_diff", props.sessionID, reconcile(props.diff, { key: "file" }))
+      const diff = Array.isArray(props.diff) ? props.diff : []
+      input.setStore("session_diff", props.sessionID, reconcile(diff, { key: "file" }))
       break
     }
     case "todo.updated": {
 
@@ -414,7 +414,11 @@ export default function Page() {
   }
 
   const info = createMemo(() => (params.id ? sync.session.get(params.id) : undefined))
-  const diffs = createMemo(() => (params.id ? (sync.data.session_diff[params.id] ?? []) : []))
+  const diffs = createMemo(() => {
+    if (!params.id) return []
+    const raw = sync.data.session_diff[params.id]
+    return Array.isArray(raw) ? raw : []
+  })
   const reviewCount = createMemo(() => Math.max(info()?.summary?.files ?? 0, diffs().length))
   const hasReview = createMemo(() => reviewCount() > 0)
   const reviewTab = createMemo(() => isDesktop())
@@ -545,7 +549,10 @@ export default function Page() {
     return open
   }, desktopReviewOpen())
 
-  const turnDiffs = createMemo(() => lastUserMessage()?.summary?.diffs ?? [])
+  const turnDiffs = createMemo(() => {
+    const raw = lastUserMessage()?.summary?.diffs
+    return Array.isArray(raw) ? raw : []
+  })
   const reviewDiffs = createMemo(() => (store.changes === "session" ? diffs() : turnDiffs()))
 
   const newSessionWorktree = createMemo(() => {
 
@@ -55,7 +55,11 @@ export function SessionSidePanel(props: {
   const treeWidth = createMemo(() => (fileOpen() ? `${layout.fileTree.width()}px` : "0px"))
 
   const info = createMemo(() => (params.id ? sync.session.get(params.id) : undefined))
-  const diffs = createMemo(() => (params.id ? (sync.data.session_diff[params.id] ?? []) : []))
+  const diffs = createMemo(() => {
+    if (!params.id) return []
+    const raw = sync.data.session_diff[params.id]
+    return Array.isArray(raw) ? raw : []
+  })
   const reviewCount = createMemo(() => Math.max(info()?.summary?.files ?? 0, diffs().length))
   const hasReview = createMemo(() => reviewCount() > 0)
   const diffsReady = createMemo(() => {
Original file line number	Diff line number	Diff line change
`@@ -160,7 +160,8 @@ export function applyDirectoryEvent(input: {`
`160`	`160`	`}`
`161`	`161`	`case "session.diff": {`
`162`	`162`	`const props = event.properties as { sessionID: string; diff: FileDiff[] }`
`163`		`- input.setStore("session_diff", props.sessionID, reconcile(props.diff, { key: "file" }))`
	`163`	`+ const diff = Array.isArray(props.diff) ? props.diff : []`
	`164`	`+ input.setStore("session_diff", props.sessionID, reconcile(diff, { key: "file" }))`
`164`	`165`	`break`
`165`	`166`	`}`
`166`	`167`	`case "todo.updated": {`