Exception in rendering!

Message: Cannot read property 'thumbnail' of undefined

TypeError: Cannot read property 'thumbnail' of undefined
    at Yb (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:74:323176)
    at a (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:69:10304)
    at mt (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:69:11308)
    at t.IDhZ.t.render (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:69:13818)
    at t.IDhZ.t.read (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:69:13443)
    at renderToString (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:69:18200)
    at ReviewApp (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:74:325205)
    at KB5t.e.default (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:69:23450)
    at e.default (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:54:758)
    at Object.serverRenderReactComponent (/tmp/nacmartin_phpexecjs5d84f6ae5c4133.77358365.js:74:59048)