Fixed hologram bug

eco-core/core-plugin/src/main/kotlin/com/willfp/ecocrates/EcoCratesPlugin.kt

@@ -18,6 +18,7 @@ import com.willfp.ecocrates.converters.impl.SpecializedCratesConverter
 import com.willfp.ecocrates.crate.CrateKeyListener
 import com.willfp.ecocrates.crate.Crates
 import com.willfp.ecocrates.crate.placed.CrateDisplay
+import com.willfp.ecocrates.crate.placed.HologramBugFixer
 import com.willfp.ecocrates.crate.placed.PlacedCrates
 import com.willfp.ecocrates.display.KeyDisplay
 import com.willfp.ecocrates.reward.Rewards
@@ -110,7 +111,8 @@ class EcoCratesPlugin : EcoPlugin() {
     override fun loadListeners(): List<Listener> {
         return listOf(
             PlacedCrateListener(this),
-            CrateKeyListener()
+            CrateKeyListener(),
+            HologramBugFixer
         )
     }
 

eco-core/core-plugin/src/main/kotlin/com/willfp/ecocrates/crate/placed/HologramBugFixer.kt

@@ -0,0 +1,17 @@
+package com.willfp.ecocrates.crate.placed
+
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.world.ChunkUnloadEvent
+
+object HologramBugFixer: Listener {
+    @EventHandler
+    fun handle(event: ChunkUnloadEvent) {
+        val chunk = event.chunk
+        for (crate in PlacedCrates.values()) {
+            if (crate.location.chunk == chunk) {
+                crate.handleChunkUnload()
+            }
+        }
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/ecocrates/crate/placed/PlacedCrate.kt

@@ -11,7 +11,7 @@ class PlacedCrate(
     blockLocation: Location
 ) {
     // Center the location, they're mutable because bukkit is bad at designing APIs.
-    private val location = blockLocation.clone().apply {
+    val location = blockLocation.clone().apply {
         x += 0.5
         y += 0.5
         z += 0.5
@@ -42,6 +42,10 @@ class PlacedCrate(
         item?.remove()
     }
 
+    internal fun handleChunkUnload() {
+        hologram.remove()
+    }
+
     private fun tickHolograms(tick: Int) {
         var frameToShow: HologramFrame? = null