Hello! I'm running this in a pack alongside Quality Turrets Reworked mod. When the Solar Laser Tower leveled up in quality, it caused this error:

The mod Quality Turrets Reworked (0.11.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event quality-turrets-reworked::on_entity_died (ID 4)
The mod Cheese's Concentrated Solar (0.5.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event ch-concentrated-solar::script_raised_built (ID 92)
ch-concentrated-solar/control/database.lua:89: DATABASE CORRUPTION: Mirror is linked to an invalid tower
stack traceback:
[C]: in function 'assert'
ch-concentrated-solar/control/database.lua:89: in function 'link_mirror_to_tower'
ch-concentrated-solar/control/database.lua:169: in function 'link_mirror_to_tower_if_closer'
ch-concentrated-solar/control/database.lua:403: in function 'on_built_entity_callback'
ch-concentrated-solar/control.lua:50: in function <ch-concentrated-solar/control.lua:49>
stack traceback:
[C]: in function 'create_entity'
quality-turrets-reworked/control.lua:204: in function 'DidTurretKill'
quality-turrets-reworked/control.lua:131: in function <quality-turrets-reworked/control.lua:127>

Unsure which mod is more responsible in causing this, so I'm informing you both. Thanks!

Hi! I believe the crash is due to a strict assertion in ch-concentrated-solar/control/database.lua:89 (“DATABASE
CORRUPTION: Mirror is linked to an invalid tower”).
When another mod replaces a tower via create_entity with raise_built = true, there’s a short window where a mirror
still points at a now-invalid tower. Your code currently asserts in that case, which hard-crashes.

Suggested fix:

• In db.link_mirror_to_tower, if storage.mirrors[mid].tower exists but is invalid, clean up that relation instead of
  asserting (e.g., remove mirror->tower link and proceed to relink).
• Alternatively, defensively validate in db.link_mirror_to_tower_if_closer / db.on_built_entity_callback before
  linking.

This would make the mod robust against external fast-replace/upgrade flows.

👍