Nested options vector in q-select breaks rendering of page

[michaelfliegner]

This used to work with Stipple 0.26 under julia 1.8.2.

Reading option values from a nested vector in q-select crashes rendering of entire page
<q- select v-model="tariffcalculation['calculation_target']['selected']" :options="tariffcalculation['calculation_target']['options']"> {{tariffcalculation['calculation_target']['label']}} </q-select>