diff --git a/visualizer/org.eclipse.cdt.visualizer.examples/src/org/eclipse/cdt/visualizer/examples/sourcegraph/SourceGraphVisualizer.java b/visualizer/org.eclipse.cdt.visualizer.examples/src/org/eclipse/cdt/visualizer/examples/sourcegraph/SourceGraphVisualizer.java
index 1a0fe97823a..86331a9dfda 100644
--- a/visualizer/org.eclipse.cdt.visualizer.examples/src/org/eclipse/cdt/visualizer/examples/sourcegraph/SourceGraphVisualizer.java
+++ b/visualizer/org.eclipse.cdt.visualizer.examples/src/org/eclipse/cdt/visualizer/examples/sourcegraph/SourceGraphVisualizer.java
@@ -7,6 +7,7 @@
  *
  * Contributors:
  *     William R. Swanson (Tilera Corporation)
+ *     Xavier Raynaud <xavier.raynaud@kalray.eu> - fix #428424
  *******************************************************************************/
 
 package org.eclipse.cdt.visualizer.examples.sourcegraph;
@@ -137,10 +138,13 @@ public class SourceGraphVisualizer extends Visualizer
 	 */
 	@Override
 	public void workbenchSelectionChanged(ISelection selection) {
-		TextSelection s =
-			(TextSelection) SelectionUtils.getSelectedObject(selection);
-		String text = s.getText();
-		m_sourceGraphControl.setSourceText(text);
+		Object o = SelectionUtils.getSelectedObject(selection);
+		if (o instanceof TextSelection) {
+			String text = ((TextSelection) o).getText();
+			m_sourceGraphControl.setSourceText(text);
+		} else {
+			m_sourceGraphControl.setSourceText(""); //$NON-NLS-1$
+		}
 	}
 	
 	public SelectionManager getSelectionManager() {