Error "Unable to get property 'value' of undefined or null reference FormsPart.aspx"

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When accessing a Nintex form, the following error occurs:

Unable to get property 'value' of undefined or null reference FormsPart.aspx

In the FormPart.aspx JavaScript to get the value from the single line textbox control, locate the following line of code:

NWF$(".option_crId_control .nf-filler-control-inner")[0].firstChild.data

And update it as follows:

NWF$(".option_crId_control .nf-hidden-associated-control").val()

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