max() does not return negative Double

Hello
**My JSON**
```
{
  "idTitle": "26a",
  "amount": -719.92
}
```

I want get 'amount' as Double, when 'idTitle' == '26a'

**My Path Expression**
`$.max($.[?(@.idTitle == '26a')].amount)`

**Expected result**
-719.92

**Real result**
5e-324

Why jsonPath return wrong result?
How may I get single Double value (not List)?

Java, com.jayway.jsonpath version 2.8.0

Thanx
