1 files changed, 4 insertions, 1 deletions
diff --git a/app/src/main/java/com/wireguard/config/Interface.java b/app/src/main/java/com/wireguard/config/Interface.java
index 7b114a09..f97c4731 100644
--- a/app/src/main/java/com/wireguard/config/Interface.java
+++ b/app/src/main/java/com/wireguard/config/Interface.java
@@ -44,11 +44,14 @@ public final class Interface {
     private final Optional<Integer> mtu;
 
     private Interface(final Builder builder) {
+        if (builder.keyPair == null)
+            throw new IllegalArgumentException("Interfaces must have a private key");
+
         // Defensively copy to ensure immutability even if the Builder is reused.
         addresses = Collections.unmodifiableSet(new LinkedHashSet<>(builder.addresses));
         dnsServers = Collections.unmodifiableSet(new LinkedHashSet<>(builder.dnsServers));
         excludedApplications = Collections.unmodifiableSet(new LinkedHashSet<>(builder.excludedApplications));
-        keyPair = Objects.requireNonNull(builder.keyPair, "Interfaces must have a private key");
+        keyPair = builder.keyPair;
         listenPort = builder.listenPort;
         mtu = builder.mtu;
     }