fix: add check for missing address or chainId when getting siwe session

.changeset/curly-cameras-call.md

@@ -0,0 +1,23 @@
+---
+'@reown/appkit-siwe': patch
+'@apps/demo': patch
+'@apps/gallery': patch
+'@reown/appkit-adapter-ethers': patch
+'@reown/appkit-adapter-ethers5': patch
+'@reown/appkit-adapter-polkadot': patch
+'@reown/appkit-adapter-solana': patch
+'@reown/appkit-adapter-wagmi': patch
+'@reown/appkit': patch
+'@reown/appkit-utils': patch
+'@reown/appkit-cdn': patch
+'@reown/appkit-common': patch
+'@reown/appkit-core': patch
+'@reown/appkit-experimental': patch
+'@reown/appkit-polyfills': patch
+'@reown/appkit-scaffold-ui': patch
+'@reown/appkit-siwx': patch
+'@reown/appkit-ui': patch
+'@reown/appkit-wallet': patch
+---
+
+Adds check for missing address or chainId when getting siwe session for guarantee of backwards compatibility.

packages/siwe/src/mapToSIWX.ts

@@ -13,7 +13,17 @@ const subscriptions: (() => void)[] = []
 export function mapToSIWX(siwe: AppKitSIWEClient): SIWXConfig {
   async function getSession() {
     try {
-      return await siwe.methods.getSession()
+      const response = await siwe.methods.getSession()
+
+      if (!response?.address) {
+        throw new Error('SIWE session is missing address')
+      }
+
+      if (!response?.chainId) {
+        throw new Error('SIWE session is missing chainId')
+      }
+
+      return response
     } catch (error) {
       console.warn('AppKit:SIWE:getSession - error:', error)
 
@@ -55,7 +65,7 @@ export function mapToSIWX(siwe: AppKitSIWEClient): SIWXConfig {
       if (siwe.options.signOutOnAccountChange) {
         const session = await getSession()
 
-        const lowercaseSessionAddress = session?.address.toLowerCase()
+        const lowercaseSessionAddress = session?.address?.toLowerCase()
         const lowercaseCaipAddress =
           CoreHelperUtil?.getPlainAddress(activeCaipAddress)?.toLowerCase()
 
@@ -164,7 +174,7 @@ export function mapToSIWX(siwe: AppKitSIWEClient): SIWXConfig {
 
         const siweSession = await getSession()
         const siweCaipNetworkId = `eip155:${siweSession?.chainId}`
-        const lowercaseSessionAddress = siweSession?.address.toLowerCase()
+        const lowercaseSessionAddress = siweSession?.address?.toLowerCase()
         const lowercaseCaipAddress = address?.toLowerCase()
 
         if (

packages/siwe/tests/mapToSIWX.test.ts

@@ -243,6 +243,24 @@ describe('SIWE: mapToSIWX', () => {
 
       await expect(siwx.getSessions('eip155:1', 'mock-address')).resolves.toMatchObject([])
     })
+
+    it('should accept undefined address or chain', async () => {
+      const siwx = mapToSIWX(siweConfig)
+
+      vi.spyOn(siweConfig.methods, 'getSession').mockResolvedValueOnce({
+        address: undefined as any,
+        chainId: 1
+      })
+
+      await expect(siwx.getSessions('eip155:1', 'mock-address')).resolves.toMatchObject([])
+
+      vi.spyOn(siweConfig.methods, 'getSession').mockResolvedValueOnce({
+        address: 'mock-address',
+        chainId: undefined as any
+      })
+
+      await expect(siwx.getSessions('eip155:1', 'mock-address')).resolves.toMatchObject([])
+    })
   })
 
   describe('siwe.options.signOutOnNetworkChange', () => {