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    <p>I think the error is pretty straightforward: either <code>Xrm.Page.getAttribute("po_contractterm").getValue()[0].keyValues</code> has no property <code>po_months</code> or <code>Xrm.Page.getAttribute("po_contractterm").getValue()[0].keyValues.po_months === null</code></p> <p>Your code is navigating through a lot of properties on one line. If you cannot guarantee the existence of something at every one of those properties, you're asking for trouble.</p> <p>Since I think you're still a bit confused, set a breakpoint just before the error line and see , of all the following possible expressions, what fails. </p> <pre><code>Xrm.Page.getAttribute("po_contractterm").getValue() //this shouldn't be null Xrm.Page.getAttribute("po_contractterm").getValue()[0] Xrm.Page.getAttribute("po_contractterm").getValue()[0].keyValues Xrm.Page.getAttribute("po_contractterm").getValue()[0].keyValues.po_months //this probably doesn't exist or is null. Xrm.Page.getAttribute("po_contractterm").getValue()[0].keyValues.po_months.value </code></pre> <p>We can eliminate checking part of the expression <code>Xrm.Page.getAttribute("po_contractterm").getValue()</code> because that part is tested in the <code>if</code>. It wouldn't hurt to check it just to keep your sanity, though, and with the Visual Studio debugger, I would think you should be able to click navigate through each of these anyway, unless the object is too large. It'd also be useful to know if the debugger is lying to you, as some of your comments seem to suggest you believe. Debuggers do <em>occasionally</em> lie, or (much more often) present information quite obtusely. </p> <p>This is something you can't be lazy with. Well, maybe if you use something like <a href="http://goessner.net/articles/JsonPath/" rel="nofollow">JSONPath</a>, you can be <em>a bit</em> lazy, but otherwise, if you are not going to use a tool like that, make sure the path exists when you need it, or do proper testing in case parts of it might not exist.</p>
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    1. COThanks for your answer. You're right, I am confused. What I don't understand is why `Xrm.Page.getAttribute("po_contractterm").getValue()[0].keyValues.po_months` is null when the lookup is populated via javascript but not when it's populated by the user. Every record of type Contract Terms has a value for po_months (it's a required field and there are only a handful of possible records). The only thing different between the working situation and the broken situation is how that lookup is populated - javascript or manually. FYI I updated my update in the initial question.
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    2. COThanks again. I gave you an upvote but I had to mark the other answer as correct because it's what explained to me exactly what was going on and why the property was null. I really appreciate your input and guidance.
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