diff --git a/.changeset/long-windows-listen.md b/.changeset/long-windows-listen.md
new file mode 100644
index 00000000..ddadd597
--- /dev/null
+++ b/.changeset/long-windows-listen.md
@@ -0,0 +1,12 @@
+---
+'@blocto/aptos-wallet-adapter-plugin': patch
+'@blocto/connectkit-connector': patch
+'@blocto/rainbowkit-connector': patch
+'@blocto/web3-react-connector': patch
+'@blocto/web3modal-connector': patch
+'@blocto/wagmi-connector': patch
+'@blocto/sdk': patch
+'@blocto/dappauth': patch
+---
+
+fix: handle existedSDK handle window not defined
diff --git a/packages/blocto-sdk/src/providers/aptos.ts b/packages/blocto-sdk/src/providers/aptos.ts
index fe70100d..a670cc7d 100644
--- a/packages/blocto-sdk/src/providers/aptos.ts
+++ b/packages/blocto-sdk/src/providers/aptos.ts
@@ -67,6 +67,7 @@ export default class AptosProvider
   sessionKey: KEY_SESSION;
 
   private get existedSDK() {
+    if (typeof window === 'undefined') return undefined;
     return (window as any).bloctoAptos;
   }
 
@@ -147,7 +148,6 @@ export default class AptosProvider
     transaction: AptosTypes.TransactionPayload,
     txOptions: TxOptions = {}
   ): Promise<{ hash: AptosTypes.HexEncodedBytes }> {
-
     if (this.existedSDK) {
       return this.existedSDK.signAndSubmitTransaction(transaction, txOptions);
     }
@@ -217,7 +217,6 @@ export default class AptosProvider
   }
 
   async signMessage(payload: SignMessagePayload): Promise<SignMessageResponse> {
-
     const formattedPayload = checkMessagePayloadFormat(payload);
 
     if (this.existedSDK) {
@@ -291,7 +290,10 @@ export default class AptosProvider
     if (this.existedSDK) {
       return new Promise((resolve, reject) =>
         // add a small delay to make sure the network has been switched
-        setTimeout(() => this.existedSDK.connect().then(resolve).catch(reject), 10)
+        setTimeout(
+          () => this.existedSDK.connect().then(resolve).catch(reject),
+          10
+        )
       );
     }
 
@@ -406,18 +408,16 @@ export default class AptosProvider
   }
 
   override on(event: string, listener: (arg: any) => void): void {
-    if (this.existedSDK)
-      this.existedSDK.on(event, listener);
-  
+    if (this.existedSDK) this.existedSDK.on(event, listener);
+
     super.on(event, listener);
   }
-  
+
   override removeListener(event: string, listener: (arg: any) => void): void {
-    if (this.existedSDK)
-      this.existedSDK.off(event, listener);
-  
+    if (this.existedSDK) this.existedSDK.off(event, listener);
+
     super.removeListener(event, listener);
   }
-  
+
   off = this.removeListener;
 }
diff --git a/packages/blocto-sdk/src/providers/ethereum.ts b/packages/blocto-sdk/src/providers/ethereum.ts
index 2ab78b76..dcf019ef 100644
--- a/packages/blocto-sdk/src/providers/ethereum.ts
+++ b/packages/blocto-sdk/src/providers/ethereum.ts
@@ -74,6 +74,7 @@ export default class EthereumProvider
   };
 
   private get existedSDK() {
+    if (typeof window === 'undefined') return undefined;
     return (window as any).ethereum;
   }
 
@@ -647,6 +648,13 @@ export default class EthereumProvider
   // eip-1102 alias
   // DEPRECATED API: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1102.md
   async enable(email?: string): Promise<ProviderAccounts> {
+    if (typeof window === 'undefined') {
+      throw ethErrors.provider.custom({
+        code: 1001,
+        message: 'Blocto SDK only works in browser environment',
+      });
+    }
+
     const { walletServer, blockchainName, sessionKeyEnv } =
       await this.#getBloctoProperties();