From cbe5205dfd787c3de425eed3d3638b34a25637b3 Mon Sep 17 00:00:00 2001
From: Renato Alcara <alcararenato@gmail.com>
Date: Fri, 20 Feb 2026 01:19:04 -0300
Subject: [PATCH] fix: validate LTHashState version to prevent app state
 crashes

fix: validate LTHashState version to prevent app state crashes
---
 src/Socket/chats.ts     | 4 +++-
 src/Utils/chat-utils.ts | 7 +++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/Socket/chats.ts b/src/Socket/chats.ts
index 07a36845..8ae89566 100644
--- a/src/Socket/chats.ts
+++ b/src/Socket/chats.ts
@@ -40,6 +40,7 @@ import {
 	extractSyncdPatches,
 	generateProfilePicture,
 	getHistoryMsg,
+	ensureLTHashStateVersion,
 	newLTHashState,
 	processSyncAction
 } from '../Utils'
@@ -595,6 +596,7 @@ export const makeChatsSocket = (config: SocketConfig) => {
 						let state = result[name]
 
 						if (state) {
+							state = ensureLTHashStateVersion(state)
 							if (typeof initialVersionMap[name] === 'undefined') {
 								initialVersionMap[name] = state.version
 							}
@@ -935,7 +937,7 @@ export const makeChatsSocket = (config: SocketConfig) => {
 				await resyncAppState([name], false)
 
 				const { [name]: currentSyncVersion } = await authState.keys.get('app-state-sync-version', [name])
-				initial = currentSyncVersion || newLTHashState()
+				initial = currentSyncVersion ? ensureLTHashStateVersion(currentSyncVersion) : newLTHashState()
 
 				encodeResult = await encodeSyncdPatch(patchCreate, myAppStateKeyId, initial, getAppStateSyncKey)
 				const { patch, state } = encodeResult
diff --git a/src/Utils/chat-utils.ts b/src/Utils/chat-utils.ts
index 5072dfe7..d131b684 100644
--- a/src/Utils/chat-utils.ts
+++ b/src/Utils/chat-utils.ts
@@ -131,6 +131,13 @@ const generatePatchMac = (
 
 export const newLTHashState = (): LTHashState => ({ version: 0, hash: Buffer.alloc(128), indexValueMap: {} })
 
+export const ensureLTHashStateVersion = (state: LTHashState): LTHashState => {
+	if (typeof state.version !== 'number' || isNaN(state.version)) {
+		state.version = 0
+	}
+	return state
+}
+
 export const encodeSyncdPatch = async (
 	{ type, index, syncAction, apiVersion, operation }: WAPatchCreate,
 	myAppStateKeyId: string,