From ce64580c3c6c0a117c4d2955fe5f953e9589a219 Mon Sep 17 00:00:00 2001
From: Kilobyte22 <stiepen22@gmx.de>
Date: Thu, 24 Jun 2021 00:48:17 +0200
Subject: [PATCH] Fix NPE in switch after removing a link

---
 .../cil/oc2/common/tileentity/NetworkSwitchTileEntity.java   | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/main/java/li/cil/oc2/common/tileentity/NetworkSwitchTileEntity.java b/src/main/java/li/cil/oc2/common/tileentity/NetworkSwitchTileEntity.java
index ae0dbf87..a5dd1a7a 100644
--- a/src/main/java/li/cil/oc2/common/tileentity/NetworkSwitchTileEntity.java
+++ b/src/main/java/li/cil/oc2/common/tileentity/NetworkSwitchTileEntity.java
@@ -50,7 +50,10 @@ public void writeEthernetFrame(final NetworkInterface source, final byte[] frame
                 // if packet is to same port, drop
                 return;
             }
-            adjacentInterfaces[host.iface].writeEthernetFrame(this, frame, timeToLive - TTL_COST);
+            NetworkInterface iface = adjacentInterfaces[host.iface];
+            if (iface != null) {
+                iface.writeEthernetFrame(this, frame, timeToLive - TTL_COST);
+            }
             host.timestamp = tickTime;
         } else {
             super.writeEthernetFrame(source, frame, timeToLive);