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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/adaptUnique/AdaptUniqueTest2.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/adaptUnique/AdaptUniqueTest2.java
new file mode 100644
index 000000000..62e7b8ac5
--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/adaptUnique/AdaptUniqueTest2.java
@@ -0,0 +1,49 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.tests.api.readGraph.adaptUnique;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.AdaptionException;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.testing.base.WriteReadTest;
+import org.simantics.db.tests.api.readGraph.common.Ontologies;
+
+/**
+ * Checks that {@link ReadGraph#adapt(org.simantics.db.Resource, Class)},
+ * {@link ReadGraph#adaptUnique(org.simantics.db.Resource, Class)},
+ * <code>AsyncReadGraph.forAdapted</code> fail as expected.
+ * 
+ * <p>
+ * Regression test for https://www.simulationsite.net/trac/simantics/ticket/617
+ * 
+ * @author Tuukka Lehtonen
+ */
+public class AdaptUniqueTest2 extends WriteReadTest {
+
+	@Override
+	protected void write(WriteGraph graph) throws DatabaseException {
+		written = Ontologies.relatedTypelessResource(L0, graph);
+	}
+
+	@Override
+    protected void read(ReadGraph graph) throws DatabaseException {
+		try {
+	        assertNotNull("Null not allowed", graph.adaptUnique(written, String.class));
+        } catch (AdaptionException e) {
+        	return;
+		} catch (Exception e) {
+			fail("Wrong exception: " + e.getClass().getCanonicalName());
+		}
+		fail("Should throw");
+	}	
+}