(1.15.2) NPE using isSimilar on base64 textured skulls

Hi all, I'm getting a null pointer when comparing two skulls that have been assigned a texture. Any method that uses the equals method returns the same error, including .isSimilar, and .contains ect.

The following code works perfectly on 1.14.4. But something has changed and now I get an NPE for some reason and its really confusing.

Code:

       @Override
       public void onEnable() {
          ItemStack head1 = new ItemStack(Material.PLAYER_HEAD);

          UUID uuid = UUID.randomUUID();
          GameProfile profile1 = new GameProfile(uuid, null);
          profile1.getProperties().put("textures", new Property("textures", "some random skin value"));

          setProfile(head1, profile1);

          ItemStack head2 = head1.clone();

          if(head1.isSimilar(head2)) { // Fails here
              System.out.println("Is similar");
          }

       }

       private void setProfile(ItemStack item, GameProfile profile) {
          ItemMeta meta = item.getItemMeta();
          try {
             Field field = meta.getClass().getDeclaredField("profile");
             field.setAccessible(true);
             field.set(meta, profile);
          } catch (NoSuchFieldException | IllegalAccessException ex) {
             ex.printStackTrace();
          }
          item.setItemMeta(meta);
       }
    }

My imports:

My imports (open) My imports (close)

Code:

import java.lang.reflect.Field;
import java.util.UUID;

import org.bukkit.Material;
import org.bukkit.craftbukkit.libs.org.apache.commons.codec.binary.Base64;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.inventory.meta.SkullMeta;
import org.bukkit.plugin.java.JavaPlugin;

import com.mojang.authlib.GameProfile;
import com.mojang.authlib.properties.Property;

The error:

The error (open) The error (close)

Code:

[10:57:25 ERROR]: Error occurred while enabling SkullTest v0.0.1 (Is it up to date?)
java.lang.NullPointerException: null
        at org.bukkit.craftbukkit.v1_15_R1.inventory.CraftMetaSkull.equalsCommon(CraftMetaSkull.java:220) ~[patched_1.15.2.jar:git-Paper-112]
        at org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemFactory.equals(CraftItemFactory.java:307) ~[patched_1.15.2.jar:git-Paper-112]
        at org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemFactory.equals(CraftItemFactory.java:294) ~[patched_1.15.2.jar:git-Paper-112]
        at org.bukkit.inventory.ItemStack.isSimilar(ItemStack.java:293) ~[patched_1.15.2.jar:git-Paper-112]
        at me.tango.skulltest.Main.onEnable(Main.java:34) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.15.2.jar:git-Paper-112]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) ~[patched_1.15.2.jar:git-Paper-112]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:435) ~[patched_1.15.2.jar:git-Paper-112]
        at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugin(CraftServer.java:470) ~[patched_1.15.2.jar:git-Paper-112]
        at org.bukkit.craftbukkit.v1_15_R1.CraftServer.enablePlugins(CraftServer.java:384) ~[patched_1.15.2.jar:git-Paper-112]
        at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:482) ~[patched_1.15.2.jar:git-Paper-112]
        at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:298) ~[patched_1.15.2.jar:git-Paper-112]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:885) ~[patched_1.15.2.jar:git-Paper-112]
        at java.lang.Thread.run(Thread.java:834) [?:?]
[10:57:25 INFO]: [SkullTest] Disabling SkullTest v0.0.1

NOTE: I am able to get the skull ingame with texture, but errors when doing any comparing methods.

Any help appreciated!