Found a bug.
When I place cursor to Sadalsuud's Hullmod 'Constellate Formulation - Sadalsuud',
484896 [Thread-2] ERROR com.fs.starfarer.combat.CombatMain java.lang.NullPointerException: Cannot invoke "com.fs.starfarer.ui.impl.StandardTooltipV2Expandable.getPanel()" because "<parameter1>" is null 161612
java.lang.NullPointerException: Cannot invoke "com.fs.starfarer.ui.impl.StandardTooltipV2Expandable.getPanel()" because "<parameter1>" is null 161613
at com.fs.starfarer.ui.impl.StandardTooltipV2Expandable.updateSizeAsUIElement(Unknown Source) 161614
at com.fs.starfarer.ui.impl.StandardTooltipV2Expandable.addImageWithText(Unknown Source) 161615
at data.hullmods.gr_DarkSeries_Dummy.addPostDescriptionSection(gr_DarkSeries_Dummy.java:58) 161616
at com.fs.starfarer.ui.impl.StandardTooltipV2$12.createImpl(Unknown Source) 161617
...
this pops up and the game shuts down.
Wish for the fix patch or way to solve from user.
The bug is in gr_DarkSeries_Dummy.java, line 58 (duh). Line "tooltip.addImageWithText(pad);" is duplicated; should only be one - second call fails with the null pointer exception.
I've removed extra line, recompiled the class and replaced it in the jar and now the tooltip works. 1 minute fix if you have the environment ready, took me 20 to set it up
I probably have no right to upload the jar, so I'll leave it to the author.