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diff --git a/tests/org.eclipse.swt.tests/ManualTests/org/eclipse/swt/tests/manual/Bug500475_StyledText_NPE_on_selection_drag.java b/tests/org.eclipse.swt.tests/ManualTests/org/eclipse/swt/tests/manual/Bug500475_StyledText_NPE_on_selection_drag.java
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+++ b/tests/org.eclipse.swt.tests/ManualTests/org/eclipse/swt/tests/manual/Bug500475_StyledText_NPE_on_selection_drag.java
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+/*******************************************************************************
+ * Copyright (c) 2018 Red Hat and others. All rights reserved.
+ * The contents of this file are made available under the terms
+ * of the GNU Lesser General Public License (LGPL) Version 2.1 that
+ * accompanies this distribution (lgpl-v21.txt).  The LGPL is also
+ * available at http://www.gnu.org/licenses/lgpl.html.  If the version
+ * of the LGPL at http://www.gnu.org is different to the version of
+ * the LGPL accompanying this distribution and there is any conflict
+ * between the two license versions, the terms of the LGPL accompanying
+ * this distribution shall govern.
+ *
+ * Contributors:
+ *     Red Hat - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.swt.tests.manual;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.custom.StyledText;
+import org.eclipse.swt.layout.FillLayout;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Shell;
+
+/**
+ * Description: StyledText NPE on selection drag.
+ * Steps to reproduce: Double click in the text but do not release the mouse button after second click. Drag around
+ *     the text such that scrolling of the text widget does happen.
+ * Expected results: No exceptions should be raised.
+ * Actual results: Application dies because of NPE.
+ */
+public class Bug500475_StyledText_NPE_on_selection_drag {
+
+	public static void main(String[] args) {
+		Display display = new Display();
+		final Shell shell = new Shell(display);
+		shell.setSize(200, 200);
+		shell.setLayout(new FillLayout());
+
+		StyledText text = new StyledText(shell, SWT.BORDER);
+		text.setDoubleClickEnabled(false); // exception does happen only if this flag is 'false'
+		text.setText("This is some dummy text. We need enough text to have the scroll bars appear.");
+
+		shell.open();
+		while (!shell.isDisposed()) {
+			if (!display.readAndDispatch())
+				display.sleep();
+		}
+		display.dispose();
+	}
+}