Hi all,

I've just encountered a crash when calling the "--difference" option for the "adf" command in a panel-setting (no crash in a time-series setting, though).

Here is a sample script:

<hansl>

set verbose off

open grunfeld.gdt --quiet

# in levels -> WORKS

adf -1 invest --ct

# 1st differences -> CRASH

adf -1 invest --c --difference

</hansl>

This is with gretl-2026c from 2026-05-25 on my Ubuntu machine.

Thanks in advance and best wishes,

Artur