Check if the passenger is null before trying to update metadata (#1001)

* Check if the passenger is null before trying to update metadata

* Fix variable name

connector/src/main/java/org/geysermc/connector/entity/living/animal/StriderEntity.java

@@ -78,7 +78,10 @@ public class StriderEntity extends AnimalEntity {
 
         // Update the passengers if we have any
         for (long passenger : passengers) {
-            session.getEntityCache().getEntityByJavaId(passenger).updateBedrockMetadata(session);
+            Entity passengerEntity = session.getEntityCache().getEntityByJavaId(passenger);
+            if (passengerEntity != null) {
+                passengerEntity.updateBedrockMetadata(session);
+            }
         }
 
         super.updateBedrockMetadata(session);