Failed to read BestEffortCallback peaks

[gfabbris]

During the measurements we came along this error during a macro:

<ipython-input-53-3d84b7bb59aa> in moveWL3()
     83 
     84     yield from mv(energy, _energy)
---> 85     yield from align_mono()
     86     yield from align_pr(_energy, _offset)
     87 

<ipython-input-53-3d84b7bb59aa> in align_mono()
     17     # Scan thf2, move to max
     18     yield from lup(mono.thf2, -6, 6, 40, 0.3)
---> 19     yield from maxi(mono.thf2)
     20 
     21     # Scan chi2, move to cen

~/.ipython/profile_bluesky/startup/instrument/plans/center_maximum.py in maxi(positioner, detector)
     66                             "1 detector was plotted")
     67         else:
---> 68             pos = peaks['max'][list(peaks['cen'].keys())[0]][0]
     69     else:
     70         pos = peaks['max'][detector][0]

IndexError: list index out of range

This plan (moveWL3()) was ran several times during the week and this issue never came up. I also ran the same scans again (both RE(maxi(mono.thf2)) and moveWL3()) right after the error, and it was not reproduced.

My guess is that the fitting in the BestEffortCallback.peaks was not done when pos = peaks['max'][list(peaks['cen'].keys())[0]][0] was called. But not sure if the RE moves on even if the BestEffortCallback is not done.