diff --git a/applications/appunorganized/appunorganized-plugins/org.csstudio.swt.rtplot/src/org/csstudio/swt/rtplot/internal/SnapshotAction.java b/applications/appunorganized/appunorganized-plugins/org.csstudio.swt.rtplot/src/org/csstudio/swt/rtplot/internal/SnapshotAction.java
index 839d736aed..0bb4577656 100644
--- a/applications/appunorganized/appunorganized-plugins/org.csstudio.swt.rtplot/src/org/csstudio/swt/rtplot/internal/SnapshotAction.java
+++ b/applications/appunorganized/appunorganized-plugins/org.csstudio.swt.rtplot/src/org/csstudio/swt/rtplot/internal/SnapshotAction.java
@@ -76,10 +76,15 @@ protected IStatus run(final IProgressMonitor progress)
                     try
                     {    // Create snapshot, save to file
                         final ImageLoader loader = new ImageLoader();
-                        final Image image = plot.getImage();
-                        loader.data = new ImageData[] { image.getImageData() };
-                        image.dispose();
+                        // In Eclipse 2020-12 we cannot seem to get the Image on
+                        // a background thread so must schedule it on the UI thread.
+                        shell.getDisplay().syncExec(() -> {
+                            final Image image = plot.getImage();
+                            loader.data = new ImageData[] { image.getImageData() };
+                            image.dispose();
+                        });
                         loader.save(path.get(), SWT.IMAGE_PNG);
+
                         // Done!
                         break;
                     }