Cross table error: d.size is not a function

[jajm]

When building a cross table report, the report is not displayed and the following error appears in browser console:

Error: d.size is not a function
N@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:876:13491
n@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:876:8446
o@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:876:8671
init/l<@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:876:4677
each@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:1:2775
each@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:1:1417
init@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:876:184
y.fn.cypivot@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:876:16675
link/</<@http://biblibre-urungi.test.biblibre.eu/js/report/directives/reportView.js:55:50
e/<@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:141:434
$eval@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:156:65
$digest@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:153:123
$apply@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:156:361
l@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:108:192
K@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:112:376
tg/</N.onload@http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:113:338
bundle.min.js:128:446
    f http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:128
    get http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:101
    e http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:142
    $eval http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:156
    $digest http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:153
    $apply http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:156
    l http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:108
    K http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:112
    onload http://biblibre-urungi.test.biblibre.eu/js/bundle.min.js:113

To Reproduce
Steps to reproduce the behavior:

1. Build a simple cross table report
2. Click on 'Refresh data'

Expected behavior
The report should be displayed

Client (please complete the following information):

• Browser: Firefox 66.0.4