Attempts to fix issue #mmocore-0417. Adds limit on amount of skills that can be bound.

src/main/java/net/Indyuce/mmocore/api/player/PlayerData.java

@@ -66,7 +66,7 @@ public class PlayerData extends OfflinePlayerData {
 	private final List<UUID> friends = new ArrayList<>();
 	private final Set<String> waypoints = new HashSet<>();
 	private final Map<String, Integer> skills = new HashMap<>();
-	private final List<SkillInfo> boundSkills = new ArrayList<>();
+	private final List<SkillInfo> boundSkills = new ArrayList<>(5);
 	private final PlayerProfessions collectSkills = new PlayerProfessions(this);
 	private final PlayerSkillData skillData = new PlayerSkillData(this);
 	private final PlayerAttributes attributes = new PlayerAttributes(this);
@@ -688,14 +688,12 @@ public class PlayerData extends OfflinePlayerData {
 	}
 
 	public SkillInfo getBoundSkill(int slot) {
+		slot = Math.max(0, slot);
 		return slot >= boundSkills.size() ? null : boundSkills.get(slot);
 	}
 
 	public void setBoundSkill(int slot, SkillInfo skill) {
-		if (boundSkills.size() < 6)
-			boundSkills.add(skill);
-		else
-			boundSkills.set(slot, skill);
+		boundSkills.set(Math.min(5, Math.max(0, slot)), skill);
 	}
 
 	public void unbindSkill(int slot) {

src/main/java/net/Indyuce/mmocore/api/player/social/Party.java

@@ -7,6 +7,7 @@ import java.util.Map;
 import java.util.UUID;
 import java.util.function.Consumer;
 
+import net.Indyuce.mmocore.api.experience.EXPSource;
 import org.bukkit.entity.Player;
 
 import net.Indyuce.mmocore.MMOCore;

src/main/java/net/Indyuce/mmocore/api/skill/Skill.java

@@ -130,7 +130,7 @@ public abstract class Skill {
 	}
 
 	/*
-	 * not overriden for passive skills therefore not abstract.
+	 * not overridden for passive skills therefore not abstract.
 	 */
 	public SkillResult whenCast(PlayerData data, SkillInfo skill) {
 		return new SkillResult(data, skill);