Do not prompt user on broken link

I have an excel file that is intended to generate a graph for management's viewing pleasure.

This file pulls totals from external links. The way I have it set up is that every month our log is saved to a naming scheme involving the date, then a fresh log is created for the current month. So, for each month I have "log mm-yyyy".

Now, the chart file is a thirteen month rolling chart (meaning every month it must show the thirteen most recent month's totals). I have created a macro to automatically update the links, based on an input in cell A:1 (meaning you can enter a date in the past and view the thirteen months previous). The problem is that we have only been doing the log for 10 months. So, when the macro runs to update the links, and it gets to months 11 through 13, it pops up a window for the user to manually browse for the missing(non-existent) files. There are quite a few cells that contain links to various information on these logs. I get a prompt for each cell and have to click "cancel". Once I have clicked cancel through all of the broken links, then everything works great.

My question (after all that) is, is there a way to suppress the prompt for the user to search for the missing file? Like I said, this chart is for management, and they shouldn't have to click cancel a dozen times just o look at a chart. If the file doesn't exist, then just break the link.

Obviously once the next three months are over, this problem will disappear, but in the mean time I need a solution.