- if (prev != null)
- add_times(series, (int) prev.value, prev.time, series.accel_series.last().time);
+ if (prev != null) {
+ AltosTimeValue last_accel = series.accel_series.last();
+ if (last_accel != null)
+ add_times(series, (int) prev.value, prev.time, last_accel.time);
+ }