Easy to reproduce:
### 20.3.13
```
SELECT 1
FORMAT JSON

{
        "meta":
        [
                {
                        "name": "1",
                        "type": "UInt8"
                }
        ],

        "data":
        [
                {
                        "1": 1
                }
        ],

        "rows": 1,

        "statistics":
        {
                "elapsed": 0.000203731,
                "rows_read": 1,
                "bytes_read": 1
        }
}
```

### 20.4.5
```
:) select 1 format JSON

SELECT 1
FORMAT JSON

{
        "meta":
        [
                {
                        "name": "1",
                        "type": "UInt8"
                }
        ],

        "data":
        [
                {
                        "1": 1
>>>>>>>> no closing bracket <<<<<<<<<<
        ],

        "rows": 1,

        "statistics":
        {
                "elapsed": 0.000771732,
                "rows_read": 1,
                "bytes_read": 1
        }
}
```
### master
```

SELECT 1
FORMAT JSON

{
        "meta":
        [
                {
                        "name": "1",
                        "type": "UInt8"
                }
        ],

        "data":
        [
                {
                        "1": 1
>>>>>>>> no closing bracket <<<<<<<<<<
        ],

        "rows": 1,

        "statistics":
        {
                "elapsed": 0.00103364,
                "rows_read": 1,
                "bytes_read": 1
        }
}

```

{
                        fprintf(stderr, "got boring ast\n")
                        continue
                    
                    parsed_query = ast_to_process
                    query_to_send = parsed_query->formatForErrorMessage()
                    processParsedSingleQuery()
                
                tch (...)
                {
                    last_exception_received_from_server = std::make_unique<Exception>(getCurrentExceptionMessage(true), getCurrentExceptionCode())
                    received_exception_from_server = true
                    std::cerr << "Error on processing query: " << ast_to_process->formatForErrorMessage() << st << last_exception_received_from_server->message()
                
                if (!connection->isConnected())
                {
                    // Probably the server is dead beuse e found an assertion
                    // failure. Fail fast.
                    r
                
                if (received_exception_from_server)
                {
                    // Query completed ith error, ignore it and fuzz again.
                    fprintf(stderr, "Got error, ill fuzz again\n")
                    received_exception_from_server = false
                    last_exception_received_from_server.reset()
                    continue
                
                else if (ast_to_process->formatForErrorMessage().size() > 500)
                {