diff --git a/common/src/main/java/org/embeddedt/modernfix/packet/EntityIDSyncPacket.java b/common/src/main/java/org/embeddedt/modernfix/packet/EntityIDSyncPacket.java
index 66bd7106..09f48de3 100644
--- a/common/src/main/java/org/embeddedt/modernfix/packet/EntityIDSyncPacket.java
+++ b/common/src/main/java/org/embeddedt/modernfix/packet/EntityIDSyncPacket.java
@@ -43,6 +43,7 @@ public class EntityIDSyncPacket implements CustomPacketPayload {
 
     @SuppressWarnings("unchecked")
     public EntityIDSyncPacket(FriendlyByteBuf buf) {
+        this.map = new HashMap<>();
         EntityIDSyncPacket self = this;
         int numEntityClasses = buf.readVarInt();
         for(int i = 0; i < numEntityClasses; i++) {