type calculate: R expression causes execution error

[mpw-wwu]

formr_values_showifs.R.txt
Modul_Zeiten_abfragen_Variante1.xlsx

R Error: missing value where TRUE/FALSE needed

In call:
if (si.blocklaenge) {
blocklaenge = (function() {
((abends_stunden + (abends_minuten/60)) - (morgens_stunden +
(morgens_minuten/60)))/6
})()
}