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Saves made before 1.8.0 won't work properly on 1.8.x. To continue older playthroughs, using a rollback branch is recommended.
The CTD does indeed reference GUI widgets and that is most likely an issue spawned by mods, which touch upon these elements
( • More Spreadsheets Fork-1.7+
• Dense UI & Others
Expanded Production Menu)
Sadly we won't be able to assist with mod-related CTDs or games started on older major versions.