Plugin Help Error when giving item to a player

Code:

Code:java

 ItemStack crescentAxe = new ItemStack(Material.DIAMOND_SWORD);
ItemMeta crescentAxeMeta= itemStack.getItemMeta();
crescentAxeMeta.setDisplayName(ChatColor.RED + "" + ChatColor.BOLD + ChatColor.UNDERLINE + "Sword of Dancer");
crescentAxe.addUnsafeEnchantment(Enchantment.DAMAGE_UNDEAD, 5);
crescentAxe.addUnsafeEnchantment(Enchantment.DURABILITY, 4);
crescentAxe.addUnsafeEnchantment(Enchantment.LOOT_BONUS_MOBS, 1);
crescentAxe.addUnsafeEnchantment(Enchantment.LOOT_BONUS_BLOCKS, 1);
List<String> lore = crescentAxeMeta.getLore();
lore.add(ChatColor.GRAY + "Chance of looting rare item: +0.5%");
lore.add(ChatColor.GRAY + "Chance of looting more blocks: +0.5%");
lore.add(ChatColor.GRAY + "Critical dammage rate increase +15%");
lore.add(ChatColor.GRAY + "Increase damage at level 30 ( +10% )");
lore.add(ChatColor.GRAY + "Chance of life steal +10%");
lore.add(ChatColor.GRAY + "Damage deal +7.5%");
crescentAxeMeta.setLore(lore);
crescentAxe.setItemMeta(crescentAxeMeta);
playerInventory.addItem(crescentAxe);

Error:

Code:

Caused by: java.lang.NullPointerException
    at com.chargon.tmrpg.listener.LootChance.rightClickLoot(LootChance.java:162) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_65]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_65]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
    ... 15 more

Line 162 is from 'lore.add(ChatColor.GRAY + "Chance of looting rare item: +0.5%");'

how can i fix it ? ^^

 

CresentAxeMeta.getLore() is returning null.