TaskHelperTest results in errors randomly

<error message="Unique index or primary key violation: "CONSTRAINT_INDEX_24 ON PUBLIC.SCHEDULER_TASK_CONFIG(UUID) VALUES ( /* key:1 */ 2, 'FA010D31-4040-4574-A083-315A781106FA', 'Hello World Task', 'Hello World Test Task', 'org.openmrs.scheduler.tasks.HelloWorldTask', 3600, NULL, NULL, NULL, FALSE, FALSE, 1, NULL, TIMESTAMP '2006-07-18 11:03:31.0', NULL)"; SQL statement:
 insert into SCHEDULER_TASK_CONFIG (TASK_CONFIG_ID, NAME, DESCRIPTION, SCHEDULABLE_CLASS, REPEAT_INTERVAL, STARTED, START_ON_STARTUP, UUID, CREATED_BY, DATE_CREATED) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) [23505-173]" type="org.h2.jdbc.JdbcSQLException">org.h2.jdbc.JdbcSQLException: Unique index or primary key violation: "CONSTRAINT_INDEX_24 ON PUBLIC.SCHEDULER_TASK_CONFIG(UUID) VALUES ( /* key:1 */ 2, 'FA010D31-4040-4574-A083-315A781106FA', 'Hello World Task', 'Hello World Test Task', 'org.openmrs.scheduler.tasks.HelloWorldTask', 3600, NULL, NULL, NULL, FALSE, FALSE, 1, NULL, TIMESTAMP '2006-07-18 11:03:31.0', NULL)"; SQL statement:
 insert into SCHEDULER_TASK_CONFIG (TASK_CONFIG_ID, NAME, DESCRIPTION, SCHEDULABLE_CLASS, REPEAT_INTERVAL, STARTED, START_ON_STARTUP, UUID, CREATED_BY, DATE_CREATED) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?) [23505-173]
 at org.h2.message.DbException.getJdbcSQLException(DbException.java:331)
 at org.h2.message.DbException.get(DbException.java:171)
 at org.h2.message.DbException.get(DbException.java:148)
 at org.h2.index.BaseIndex.getDuplicateKeyException(BaseIndex.java:101)
 at org.h2.index.TreeIndex.add(TreeIndex.java:68)
 at org.h2.table.RegularTable.addRow(RegularTable.java:125)
 at org.h2.command.dml.Insert.insertRows(Insert.java:127)
 at org.h2.command.dml.Insert.update(Insert.java:86)
 at org.h2.command.CommandContainer.update(CommandContainer.java:79)
 at org.h2.command.Command.executeUpdate(Command.java:235)
 at org.h2.jdbc.JdbcPreparedStatement.execute(JdbcPreparedStatement.java:193)
 at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPreparedStatement.java:989)
 at org.dbunit.database.statement.SimplePreparedStatement.addBatch(SimplePreparedStatement.java:80)
 at org.dbunit.operation.RefreshOperation$RowOperation.execute(RefreshOperation.java:183)
 at org.dbunit.operation.RefreshOperation$InsertRowOperation.execute(RefreshOperation.java:249)
 at org.dbunit.operation.RefreshOperation.execute(RefreshOperation.java:112)
 at org.openmrs.test.BaseContextSensitiveTest.executeDataSet(BaseContextSensitiveTest.java:687)
 at org.openmrs.test.BaseContextSensitiveTest.executeDataSet(BaseContextSensitiveTest.java:582)
 at org.openmrs.scheduler.web.controller.TaskHelperTest.setUp(TaskHelperTest.java:42)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:483)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
 at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
 at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
 at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
 at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
 at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
 at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
 at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
 at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
 at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:59)
 at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:115)
 at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:102)
 at org.apache.maven.surefire.Surefire.run(Surefire.java:180)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:483)
 at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350)
 at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021)
 </error>