Property to get/set whether null values for variables are trapped. If set (the default) then an EvaluationException is thrown for null values of variables. If not set then null values are passed to PostfixMathCommands who will need to test for null values.

public bool TrapNullValues { get; set; }

Public Property TrapNullValues As Boolean

public:
property bool TrapNullValues {
	bool get ();
	void set (bool value);
}