Sync fails with on Ğ1 network « Cannot read property 'conditions' of null »

Almost at the end of the sync (98% of 183k blocks) this error is raised:

2018-12-27T10:58:17+01:00 - error: TypeError: Cannot read property 'conditions' of null
    at Promise.all._.where.map (/opt/duniter/app/lib/computation/QuickSync.js:158:52)
    at <anonymous>

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