Not really sure if it is bobs or angels issue, it looks like it happens when updating the settings after update certain mods that changes forces/faction.

The mod Bob's Metals, Chemicals and Intermediates mod (1.1.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event bobplates::on_configuration_changed
The mod Angel's Exploration (BETA) (0.3.13) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event angelsexploration::on_technology_effects_reset (ID 102)
angelsexploration/src/tips-and-tricks-triggers.lua:50: attempt to index field '?' (a nil value)
stack traceback:
angelsexploration/src/tips-and-tricks-triggers.lua:50: in function 'init_force_data'
angelsexploration/src/tips-and-tricks-triggers.lua:120: in function 'on_tech_research_reset'
angelsexploration/control.lua:89: in function <angelsexploration/control.lua:87>
stack traceback:
[C]: in function 'reset_technology_effects'
bobplates/control.lua:3: in function <bobplates/control.lua:1>

save and details over: https://forums.factorio.com/viewtopic.php?p=559987#p559987