From 79478c187dd2f1c949e6acefe8a845445847936e Mon Sep 17 00:00:00 2001
From: "Vitaliy.Bibaev" <vitaliy.bibaev@jetbrains.com>
Date: Fri, 19 Jan 2018 18:56:38 +0300
Subject: [PATCH] IDEA-171027 IDEA-175146 Check environment mode to avoid
 exception

---
 .../impl/src/com/intellij/debugger/memory/ui/ClassesTable.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/java/debugger/impl/src/com/intellij/debugger/memory/ui/ClassesTable.java b/java/debugger/impl/src/com/intellij/debugger/memory/ui/ClassesTable.java
index 6de5c7142b70..c722e00f3a6d 100644
--- a/java/debugger/impl/src/com/intellij/debugger/memory/ui/ClassesTable.java
+++ b/java/debugger/impl/src/com/intellij/debugger/memory/ui/ClassesTable.java
@@ -186,7 +186,7 @@ public class ClassesTable extends JBTable implements DataProvider, Disposable {
     releaseMouseListener();
     getEmptyText().setText(text);
 
-    if (getMousePosition() != null) {
+    if (!GraphicsEnvironment.isHeadless() && getMousePosition() != null) {
       setBackground(CLICKABLE_COLOR);
     }