Happy New Year 2020 from Finland!

This happened last night. Any idea what was wrong?

23.04.25 Starting run for plan comets_20200101.txt...
23.04.26 Comet elements for CK17T020 --> RA=03:25:34 Dec=55° 11' 58" (J2000)
23.04.27 ==== Starting target CK17T020 ====
23.04.27 ;
23.04.27 ; Comets 1.12.2019
23.04.27 ; C/2017 T2 (PANSTARRS)
23.04.27 ; C/2018 N2 (ASASSN)
23.04.27 ; 260P/McNaught
23.04.27 (turning tracking on for live image(s))
23.04.29 Comet elements for CK17T020 --> RA=03:25:34 Dec=55° 11' 58" (J2000)
23.04.29 Comet elements for CK17T020 --> RA=03:25:34 Dec=55° 11' 58" (J2000)
23.04.29 Start slew to CK17T020...
23.04.41 Start rotate to PA 0.0 deg (raw rotator angle 195.6)
23.04.41 (wait for slew to complete)
23.05.19 (slew complete)
23.05.19 (request plan-start pointing update)
23.05.19 Ready for CK17T020 (# 1 of 3 in set 1)
23.05.19 CK17T020 will be repeated 10 times.
23.05.21 === Starting target repeat 7 of 10 ===
23.05.22 Selecting L filter (0) for imaging
23.05.22 Pointing update: Wait and flip if within 120 sec of flip point
23.05.22 [flip check: Tn=120s HAc=14699s GW=T HAz=14819s DWz=T WF=no]
23.05.22 Doing auto-center...
23.05.22 Switching from Ha to L filter for pointing exposure
23.05.22 Focus change of -1 steps required
23.05.25 (taking 5 sec. exposure, L filter, binning = 4)
23.05.25 (using Raw readout mode)
23.43.38 **Script Error (Tracking has been stopped)**
23.43.39 Source: ACP
23.43.39 Message: The script was aborted.
23.43.39 Location: line 1533 column 33.