From ddaed51550308eceda3c9a080503cf1fdfac6ac0 Mon Sep 17 00:00:00 2001
From: jxom <7336481+jxom@users.noreply.github.com>
Date: Tue, 14 Jan 2025 11:09:42 +1100
Subject: [PATCH] fix: provider rpc error parsing

---
 .changeset/giant-pillows-wave.md |  5 +++++
 src/core/Provider.ts             |  2 ++
 src/core/_test/Provider.test.ts  | 18 ++++++++++++++++++
 3 files changed, 25 insertions(+)
 create mode 100644 .changeset/giant-pillows-wave.md

diff --git a/.changeset/giant-pillows-wave.md b/.changeset/giant-pillows-wave.md
new file mode 100644
index 00000000..8e5d2d5d
--- /dev/null
+++ b/.changeset/giant-pillows-wave.md
@@ -0,0 +1,5 @@
+---
+"ox": patch
+---
+
+Fixed parsing of Provider RPC errors.
diff --git a/src/core/Provider.ts b/src/core/Provider.ts
index ff86fc49..c847f0a5 100644
--- a/src/core/Provider.ts
+++ b/src/core/Provider.ts
@@ -435,6 +435,8 @@ export function parseErrorObject<
   const errorObject_ = errorObject as RpcResponse.ErrorObject
   const error = RpcResponse.parseErrorObject(errorObject_)
   if (error instanceof RpcResponse.InternalError) {
+    if (!error.data) return error as never
+
     const { code } = error.data as RpcResponse.ErrorObject
     if (code === DisconnectedError.code)
       return new DisconnectedError(errorObject_) as never
diff --git a/src/core/_test/Provider.test.ts b/src/core/_test/Provider.test.ts
index 067cd85b..3cfe3d92 100644
--- a/src/core/_test/Provider.test.ts
+++ b/src/core/_test/Provider.test.ts
@@ -318,6 +318,24 @@ describe('Provider.from', () => {
     )
   })
 
+  test('behavior: InternalError', async () => {
+    const provider = Provider.from({
+      async request(_) {
+        throw new RpcResponse.InternalError({
+          message: 'foo',
+        })
+      },
+    })
+
+    await expect(() =>
+      provider.request({
+        method: 'eth_blockNumber',
+      }),
+    ).rejects.toThrowErrorMatchingInlineSnapshot(
+      '[RpcResponse.InternalError: Internal JSON-RPC error.]',
+    )
+  })
+
   test('behavior: BaseError (raw)', async () => {
     const provider = Provider.from({
       async request(_) {