Fix #6439: ensure provider.supportsSubscriptions exists before watc…

…hing by subscription (#6440) * ensure `provider.supportsSubscriptions` exist before watching by subscription * update CHANGELOG.md at web3-eth
web3 · Sep 19, 2023 · 2b445bf · 2b445bf
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diff --git a/packages/web3-eth/CHANGELOG.md b/packages/web3-eth/CHANGELOG.md
@@ -191,4 +191,8 @@ Documentation:
 
 -   Added to `Web3Config` property `contractDataInputFill` allowing users to have the choice using property `data`, `input` or `both` for contract methods to be sent to the RPC provider when creating contracts. (#6377) (#6400)
 
-## [Unreleased]
+## [Unreleased]
+
+### Fixed
+
+-   Ensure provider.supportsSubscriptions exists before watching by subscription (#6440)
diff --git a/packages/web3-eth/src/utils/watch_transaction_for_confirmations.ts b/packages/web3-eth/src/utils/watch_transaction_for_confirmations.ts
@@ -61,7 +61,7 @@ export function watchTransactionForConfirmations<
 
 	// so a subscription for newBlockHeaders can be made instead of polling
 	const provider: Web3BaseProvider = web3Context.requestManager.provider as Web3BaseProvider;
-	if (provider.supportsSubscriptions()) {
+	if (provider && 'supportsSubscriptions' in provider && provider.supportsSubscriptions()) {
 		watchTransactionBySubscription({
 			web3Context,
 			transactionReceipt,