diff --git a/build.gradle b/build.gradle
index 95ce1060..07538e04 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ plugins {
 
 allprojects {
     group 'org.openrndr.extra'
-    version '0.0.27'
+    version '0.0.28'
 }
 
 repositories {
diff --git a/orx-compositor/src/main/kotlin/Compositor.kt b/orx-compositor/src/main/kotlin/Compositor.kt
index bf5f94c3..cecdb58b 100644
--- a/orx-compositor/src/main/kotlin/Compositor.kt
+++ b/orx-compositor/src/main/kotlin/Compositor.kt
@@ -67,8 +67,12 @@ class Layer internal constructor() {
                 }
 
                 if (postBufferCache.isEmpty()) {
-                    postBufferCache += colorBuffer(rt.width, rt.height)
-                    postBufferCache += colorBuffer(rt.width, rt.height)
+                    postBufferCache += colorBuffer(rt.width, rt.height).apply {
+                        Session.active.untrack(this)
+                    }
+                    postBufferCache += colorBuffer(rt.width, rt.height).apply {
+                        Session.active.untrack(this)
+                    }
                 }
             }