sib-map : Bounds are not valid

I get this error when loading the map in my app. Any idea why ?

Error: Bounds are not valid. leaflet-src.dew.js:3074:17
    fitBounds https://dev.jspm.io/npm:leaflet@1.5.1/dist/leaflet-src.dew.js:3074
    reset https://cdn.happy-dev.fr/sib-core/src/elements/sib-map.js:30
    <anonymous> http://127.0.0.1:8000/:609
    display https://unpkg.com/@startinblox/router@0.7.4/src/sib-router.js:45
    SIBRouter https://unpkg.com/@startinblox/router@0.7.4/src/sib-router.js:12

I didn't dig in yet. I thought someone might know before I spend an hour on it.