Not worth,

src/main/java/com/volmit/iris/util/data/palette/CrudeIncrementalIntIdentityHashBiMap.java

@@ -130,6 +130,10 @@ public class CrudeIncrementalIntIdentityHashBiMap<K> implements IdMap<K> {
     private int indexOf(K var0, int var1) {
         int var2;
         for (var2 = var1; var2 < this.keys.length; var2++) {
+            if (this.keys[var2] == null)
+            {
+                return 0;
+            }
             if (this.keys[var2].equals(var0))
                 return var2;
             if (this.keys[var2] == EMPTY_SLOT)

src/main/java/com/volmit/iris/util/data/palette/HashMapPalette.java

@@ -71,6 +71,11 @@ public class HashMapPalette<T> implements Palette<T> {
 
     @Override
     public void write(List<T> toList) {
-        this.values.iterator().forEachRemaining(toList::add);
+        this.values.iterator().forEachRemaining(i -> {
+            if(i != null)
+            {
+                toList.add(i);
+            }
+        });
     }
 }

src/main/java/com/volmit/iris/util/data/palette/LinearPalette.java

@@ -43,7 +43,7 @@ public class LinearPalette<T> implements Palette<T> {
                 return var1;
             }
 
-            if (this.values[var1].equals(var0))
+            if (this.values[var1] != null && this.values[var1].equals(var0))
             {
                 return var1;
             }

src/main/java/com/volmit/iris/util/data/palette/PalettedContainer.java

@@ -34,7 +34,6 @@ public class PalettedContainer<T> implements PaletteResize<T> {
 
     public PalettedContainer() {
         setBits(4);
-
     }
 
     private static int getIndex(int var0, int var1, int var2) {