Object reference not set to an instance- Blueprism error

I have installed BP 6.10 and when i am trying to evaluate the expression from a collection,i get a error stating :
"System.NullReferenceException: Object reference not set to an instance of an object."

I am having values in collection (current values) .
1.jpg :showing the data item.collection and Looped collection
2.jpg :showing decision calculation
3.jpg : Error popped up when evaluated expression.

Error Details:
System.NullReferenceException: Object reference not set to an instance of an object.
at AutomateUI.frmExpressionTest.MakeRow(IDataField item, Int32 top, Int32 tabIndex, Int32 scrollbarAdj)
at AutomateUI.frmExpressionTest.Populate()
at AutomateUI.frmExpressionTest..ctor(Control owner, clsProcess proc, String expr, clsProcessStage stage, String name)
at AutomateUI.ctlProcessExpressionBuilder.TestExpression(String localExpr)

Can any expert please help me out here


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