Fix possible division by zero in the fatigue calculation (bug #4510)

CHANGELOG.md

@@ -67,6 +67,7 @@
     Bug #4496: SpellTurnLeft and SpellTurnRight animation groups are unused
     Bug #4497: File names starting with x or X are not classified as animation
     Bug #4503: Cast and ExplodeSpell commands increase alteration skill
+    Bug #4510: Division by zero in MWMechanics::CreatureStats::setAttribute
     Feature #2606: Editor: Implemented (optional) case sensitive global search
     Feature #3083: Play animation when NPC is casting spell via script
     Feature #3276: Editor: Search- Show number of (remaining) search results and indicate a search without any results

apps/openmw/mwmechanics/creaturestats.cpp

@@ -157,7 +157,7 @@ namespace MWMechanics
                 int endurance    = getAttribute(ESM::Attribute::Endurance).getModified();
                 DynamicStat<float> fatigue = getFatigue();
                 float diff = (strength+willpower+agility+endurance) - fatigue.getBase();
-                float currentToBaseRatio = (fatigue.getCurrent() / fatigue.getBase());
+                float currentToBaseRatio = fatigue.getBase() > 0 ? (fatigue.getCurrent() / fatigue.getBase()) : 0;
                 fatigue.setModified(fatigue.getModified() + diff, 0);
                 fatigue.setCurrent(fatigue.getBase() * currentToBaseRatio);
                 setFatigue(fatigue);