From 8fd88d9ecc972653d8e3bf9462a0c5f829ffaf52 Mon Sep 17 00:00:00 2001
From: Autumn Lamonte <AutumnWalksTheLake@gmail.com>
Date: Sun, 30 Jan 2022 07:57:40 -0600
Subject: [PATCH] fix AWT headless crash

---
 src/jexer/backend/SwingTerminal.java | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/jexer/backend/SwingTerminal.java b/src/jexer/backend/SwingTerminal.java
index 918be85..76eb5d2 100644
--- a/src/jexer/backend/SwingTerminal.java
+++ b/src/jexer/backend/SwingTerminal.java
@@ -499,6 +499,10 @@ public class SwingTerminal extends LogicalScreen
         eventQueue       = new ArrayList<TInputEvent>();
 
         // Add listeners to Swing.
+        if (swing == null) {
+            // Swing isn't running.  Quite a few things might break...
+            return;
+        }
         swing.addKeyListener(this);
         swing.addWindowListener(this);
         swing.addComponentListener(this);
@@ -617,6 +621,10 @@ public class SwingTerminal extends LogicalScreen
         eventQueue       = new ArrayList<TInputEvent>();
 
         // Add listeners to Swing.
+        if (swing == null) {
+            // Swing isn't running.  Quite a few things might break...
+            return;
+        }
         swing.addKeyListener(this);
         swing.addWindowListener(this);
         swing.addComponentListener(this);