fix: provider rpc error parsing

.changeset/giant-pillows-wave.md

@@ -0,0 +1,5 @@
+---
+"ox": patch
+---
+
+Fixed parsing of Provider RPC errors.

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

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(_) {