paper-server/patches/sources/net/minecraft/server/MinecraftServer.java.patch

@@ -1262,11 +1262,12 @@
          }
      }
  
-@@ -1652,10 +_,11 @@
+@@ -1651,11 +_,12 @@
+     public void kickUnlistedPlayers(CommandSourceStack commandSource) {
          if (this.isEnforceWhitelist()) {
              PlayerList playerList = commandSource.getServer().getPlayerList();
++            if (!playerList.isUsingWhitelist()) return; // Paper - whitelist not enabled
              UserWhiteList whiteList = playerList.getWhiteList();
-+            if (!((net.minecraft.server.dedicated.DedicatedServer) this).getProperties().whiteList.get()) return; // Paper - whitelist not enabled
  
              for (ServerPlayer serverPlayer : Lists.newArrayList(playerList.getPlayers())) {
 -                if (!whiteList.isWhiteListed(serverPlayer.getGameProfile())) {

paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -883,7 +883,7 @@ public final class CraftServer implements Server {
 
     @Override
     public boolean hasWhitelist() {
-        return this.getProperties().whiteList.get();
+        return this.playerList.isUsingWhitelist();
     }
 
     // NOTE: Temporary calls through to server.properies until its replaced