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8y

In src/rpc/blockchain.cpp:

```
       "]\n"
```

```
   );
```
RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VOBJ});
UniValue result(UniValue::VOBJ);
if (request.params[0].get_str() == "status") {
```
   CoinsViewScanReserver reserver;
```
```
   if (reserver.reserve()) {
```

       throw JSONRPCError(RPC_INVALID_PARAMETER, "No scan in progress");

```
   }
```

   result.pushKV("progress", g_scan_progress);

} else if (request.params[0].get_str() == "abort") {
```
   CoinsViewScanReserver reserver;
```
```
   if (reserver.reserve()) {
```
```
       return false;
```

Since this return value is subject to several races [1], I believe you could just return NullUniValue;

[1]:

e.g. the scan finishes between the last call and this one
e.g. this call returns true, but the last start call was not (yet) actually aborted

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