Message Content Chart: JSONPath: Value Expression - ?() Filter expressions doesn't work

[andrei-palamarciuc]

Version: mqtt-spy-1.0.1-beta-b18-jar-with-dependencies

Payload
{
"book": [
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
}
]
}

Value Expression
$.book[?(@.category=='reference')].price

Result
The chart doesn't display the expected value. No error in "Show error...".