1 files changed, 6 insertions, 1 deletions
diff --git a/src/demos/testContextSharing/TestContextSharing.java b/src/demos/testContextSharing/TestContextSharing.java
index 88f453a..e50c4d0 100644
--- a/src/demos/testContextSharing/TestContextSharing.java
+++ b/src/demos/testContextSharing/TestContextSharing.java
@@ -97,7 +97,12 @@ public class TestContextSharing {
 
   class Listener implements GLEventListener {
     public void init(GLDrawable drawable) {
-      drawable.setGL(new DebugGL(drawable.getGL()));
+      // init() might get called more than once if the GLCanvas is
+      // added and removed, but we only want to install the DebugGL
+      // pipeline once
+      if (!(drawable.getGL() instanceof DebugGL)) {
+        drawable.setGL(new DebugGL(drawable.getGL()));
+      }
 
       GL gl = drawable.getGL();