[Java] Handle nullable arrays

diff --git a/src/main/java/org/ldk/util/InternalUtils.java b/src/main/java/org/ldk/util/InternalUtils.java
index f26c2ae06daa140816fdb9cb16da1d6aecedcb86..d9c3f6ef8364a4f89ec1c2653f5d747455325345 100644 (file)
--- a/src/main/java/org/ldk/util/InternalUtils.java
+++ b/src/main/java/org/ldk/util/InternalUtils.java
@@ -2,7 +2,7 @@ package org.ldk.util;
 
 public class InternalUtils {
     public static byte[] check_arr_len(byte[] arr, int length) throws IllegalArgumentException {
-        if (arr.length != length) {
+        if (arr != null && arr.length != length) {
             throw new IllegalArgumentException("Array must be of fixed size " + length + " but was of length " + arr.length);
         }
         return arr;