diff --git a/packages/ethers/src/client.ts b/packages/ethers/src/client.ts
index e9b122dd34..6b9711b930 100644
--- a/packages/ethers/src/client.ts
+++ b/packages/ethers/src/client.ts
@@ -1255,7 +1255,8 @@ export class Web3Modal extends Web3ModalScaffold {
             EthersStoreUtil.setChainId(chainId)
             // eslint-disable-next-line @typescript-eslint/no-explicit-any
           } catch (switchError: any) {
-            if (/(?<temp1>user rejected)/u.test(switchError?.message)) {
+            const message = switchError?.message as string
+            if (/(?<temp1>user rejected)/u.test(message?.toLowerCase())) {
               throw new Error('Chain is not supported')
             }
             await EthersHelpersUtil.addEthereumChain(
diff --git a/packages/ethers5/src/client.ts b/packages/ethers5/src/client.ts
index 9c25f87ba1..9373367849 100644
--- a/packages/ethers5/src/client.ts
+++ b/packages/ethers5/src/client.ts
@@ -972,7 +972,8 @@ export class Web3Modal extends Web3ModalScaffold {
             EthersStoreUtil.setChainId(chainId)
             // eslint-disable-next-line @typescript-eslint/no-explicit-any
           } catch (switchError: any) {
-            if (/(?<temp1>user rejected)/u.test(switchError?.message)) {
+            const message = switchError?.message as string
+            if (/(?<temp1>user rejected)/u.test(message?.toLowerCase())) {
               throw new Error('Chain is not supported')
             }
             await EthersHelpersUtil.addEthereumChain(