From 9f1f61d3b6747bc070cdfaa6c736e007cd61e1e0 Mon Sep 17 00:00:00 2001
From: Randy Du <randydu@gmail.com>
Date: Fri, 21 Mar 2025 07:28:44 +0800
Subject: [PATCH] Update error-decoder.ts

The errorData could be null when the error is thrown from hardhat / ethers.js, hence a "Cannot read properties of null (reading 'data')" error will occur when setting returnData in the line 67.

Example error causing the issue:
```json
{
code: 'UNKNOWN_ERROR',
  error: {
    code: -32000,
    message: "Nonce too high. Expected nonce to be 0 but got 33. Note that transactions can't be queued when automining.",
    data: {
      message: "Nonce too high. Expected nonce to be 0 but got 33. Note that transactions can't be queued when automining.",
      data: null
    }
  },
  payload: {
    method: 'eth_sendRawTransaction',
    params: [
      '0x02f8b2827a6921843b9aca00843e9a078083015644944abeaca4b05d8fa4ced09d26ad28ea298e8afac880b844a9059cbb0000000000000000000000009965507d1a55bcc2695c58ba16fb37d819b0a4dc0000000000000000000000000000000000000000000000000000000000000064c001a03c032ec0cd43679f7400e1c90a8c9c07fe3d87ed4e0bf78ec5097046cf16d1eaa03cc5e482a939684ef216bfdeb72cb15fd36558a9df53de3745e3a27eb60f7869'
    ],
    id: 28,
    jsonrpc: '2.0'
  },
  shortMessage: 'could not coalesce error'
}
```
---
 src/error-decoder.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/error-decoder.ts b/src/error-decoder.ts
index 8be69ef..1bf211a 100644
--- a/src/error-decoder.ts
+++ b/src/error-decoder.ts
@@ -60,7 +60,7 @@ export class ErrorDecoder {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     const errorData = (error as any).data ?? (error as any).error?.data
 
-    if (errorData === undefined) {
+    if (errorData === undefined || errorData === null) {
       return undefined
     }