Fix #341 (#342)

changelog.md

@@ -1,3 +1,3 @@
-# Additions
+# Fixes
 
-- Spell recipe UIs now properly work! They show ingredients, reagents, the parts they're made out of, and an affinity breakdown.
+- Fixed a critical crash occuring when trying to change the spell group on a spell with only one spell group

gradle.properties

@@ -4,7 +4,7 @@ org.gradle.daemon=false
 mod_group=com.github.minecraftschurlimods
 mod_id=arsmagicalegacy
 mod_name=Ars Magica: Legacy
-mod_version=1.2.1
+mod_version=1.2.2
 mod_author=Minecraftschurli, IchHabeHunger54
 mod_credits=Mithion for the original mod
 mod_url=https://www.curseforge.com/minecraft/mc-mods/ars-magica-legacy

src/main/java/com/github/minecraftschurlimods/arsmagicalegacy/common/spell/SpellHelper.java

@@ -199,7 +199,7 @@ public SpellCastResult invoke(ISpell spell, LivingEntity caster, Level level, @N
     public void nextShapeGroup(ItemStack stack) {
         var helper = ArsMagicaAPI.get().getSpellHelper();
         ISpell spell = helper.getSpell(stack);
-        spell.currentShapeGroupIndex((byte) ((spell.currentShapeGroupIndex() + 1) % spell.shapeGroups().size()));
+        spell.currentShapeGroupIndex((byte) ((spell.currentShapeGroupIndex() + 1) % spell.shapeGroups().stream().filter(e -> !e.isEmpty()).count()));
         helper.setSpell(stack, spell);
     }
 }