IConfiguring Tipping in XSTORE POS V18 error during transaction

I have 20 stores and at two of them during the process of tendering and adding a tip amount we receive a Help Desk Error.   I know it's a configuration issue but I just do not know where the link between the CC tender and adding Tip to the transaction and linking to our gratuity sku.  See the error below when trying to tender with CC and add tip.   Any help and direction would be appreciated.

Timestamp	Jul 22, 2020, 10:32:39 AM
Workstation ID	1
Operator ID	0
Stacktrace	Exception caught during op exec for hta.pos.tender.creditcard.HtaTipAmountOp, event=null] java.lang.NullPointerException: null at dtv.xst.dao.trn.impl.PosTransactionBaseModel.addRetailTransactionLineItem(PosTransactionBaseModel.java:55) ~[dtv-dtx.jar:18.0.0.0.654] at dtv.xst.dao.trn.impl.PosTransactionModel.addRetailTransactionLineItem(PosTransactionModel.java:1388) ~[dtv-dtx.jar:18.0.0.0.654] at hta.pos.tender.creditcard.HtaTipAmountOp.handleOpExec(HtaTipAmountOp.java:82) ~[hta-pos.jar:?] at dtv.pos.framework.op.ForwardTraversalStrategy.handleExec(ForwardTraversalStrategy.java:109) [dtv-posframework.jar:18.0.0.0.654] at dtv.pos.framework.op.DefaultOpChain.internalDoOp(DefaultOpChain.java:960) [dtv-posframework.jar:18.0.0.0.654] at dtv.pos.framework.op.DefaultOpChain.handleOpExec(DefaultOpChain.java:458) [dtv-posframework.jar:18.0.0.0.654] at dtv.pos.framework.op.OpChainProcessor.runChain(OpChainProcessor.java:671) [dtv-posframework.jar:18.0.0.0.654] at dtv.pos.framework.op.OpChainProcessor.handleXstEventImmediately(OpChainProcessor.java:291) [dtv-posframework.jar:18.0.0.0.654] at dtv.pos.framework.op.OpChainProcessor.run(OpChainProcessor.java:354) [dtv-posframework.jar:18.0.0.0.654] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]