ASSERTION FAILED: expected reference to be not null in DV

Environment

• Red Hat JBoss Data Virtualziation (DV) 6.3
• Assertion error:

09:39:06,143 ERROR [org.teiid.PROCESSOR] (Worker0_QueryProcessorQueue58) TEIID30019 Unexpected exception for request z7WVKezk1+CK.29: java.lang.AssertionError: ASSERTION FAILED: expected reference to be not null
    at org.teiid.core.util.Assertion.failed(Assertion.java:73) [teiid-common-core-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.core.util.Assertion.isNotNull(Assertion.java:100) [teiid-common-core-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.core.util.Assertion.isNotNull(Assertion.java:92) [teiid-common-core-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.relational.RelationalNode.getProjectionIndexes(RelationalNode.java:367) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.relational.JoinNode.initialize(JoinNode.java:133) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.relational.RelationalPlan.connectExternal(RelationalPlan.java:96) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.relational.RelationalPlan.connectExternal(RelationalPlan.java:102) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.relational.RelationalPlan.connectExternal(RelationalPlan.java:102) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.relational.RelationalPlan.connectExternal(RelationalPlan.java:102) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.relational.RelationalPlan.initialize(RelationalPlan.java:91) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.QueryProcessor.init(QueryProcessor.java:226) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.QueryProcessor.nextBatchDirect(QueryProcessor.java:138) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.QueryProcessor.nextBatch(QueryProcessor.java:114) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:164) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.query.processor.BatchCollector.collectTuples(BatchCollector.java:146) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.dqp.internal.process.RequestWorkItem.processMore(RequestWorkItem.java:472) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:348) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:51) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:274) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:276) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210) [teiid-engine-8.12.5.redhat-8.jar:8.12.5.redhat-8]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [rt.jar:1.8.0_74]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [rt.jar:1.8.0_74]
    at java.lang.Thread.run(Unknown Source) [rt.jar:1.8.0_74]