Fix

build.gradle

@@ -37,6 +37,7 @@ dependencies {
     shadow group: 'me.clip', name: 'placeholderapi', version: '2.10.4'
     shadow group: 'com.google.inject', name: 'guice', version: '4.2.2'
     shadow fileTree(dir: 'libs', includes: ['*.jar'])
+    compile "org.jetbrains.kotlin:kotlin-stdlib"
 }
 
 shadowJar {

src/main/scala/io/izzel/taboolib/client/packet/PacketSerializer.java

@@ -92,7 +92,7 @@ public class PacketSerializer implements Listener {
         Packet packet = null;
         try {
             packet = parser.parser((JsonObject) new JsonParser().parse(origin));
-        } catch (JsonSyntaxException ignore) {
+        } catch (NullPointerException | JsonSyntaxException ignore) {
         } catch (Throwable t) {
             t.printStackTrace();
         }