Handle bad heightmaps in 1.17->1.16.4 (#743)

ViaVersion · May 9, 2024 · 1a22b37 · 1a22b37
1 parent 6292c5a
commit 1a22b37
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/...m/viaversion/viabackwards/protocol/protocol1_16_4to1_17/packets/BlockItemPackets1_17.java b/...m/viaversion/viabackwards/protocol/protocol1_16_4to1_17/packets/BlockItemPackets1_17.java
@@ -339,6 +339,10 @@ public void register() {
 
             CompoundTag heightMaps = chunk.getHeightMap();
             for (Tag heightMapTag : heightMaps.values()) {
+                if (!(heightMapTag instanceof LongArrayTag)) {
+                    continue; // Client can handle bad data
+                }
+
                 LongArrayTag heightMap = (LongArrayTag) heightMapTag;
                 int[] heightMapData = new int[256];
                 int bitsPerEntry = MathUtil.ceilLog2((currentWorldSectionHeight << 4) + 1);