Index: /branches/autoquest-core-tasktrees-alignment/src/main/java/de/ugoe/cs/autoquest/tasktrees/temporalrelation/SequenceForTaskDetectionRuleAlignment.java
===================================================================
--- /branches/autoquest-core-tasktrees-alignment/src/main/java/de/ugoe/cs/autoquest/tasktrees/temporalrelation/SequenceForTaskDetectionRuleAlignment.java	(revision 1731)
+++ /branches/autoquest-core-tasktrees-alignment/src/main/java/de/ugoe/cs/autoquest/tasktrees/temporalrelation/SequenceForTaskDetectionRuleAlignment.java	(revision 1732)
@@ -529,5 +529,5 @@
 	 * @return
 	 */
-	public ISequence matchAsSequence(RuleApplicationData appData, Match m) {
+	synchronized public ISequence matchAsSequence(RuleApplicationData appData, Match m) {
 		ISequence sequence = taskFactory.createNewSequence();
 		appData.newTaskCreated(sequence);