Hello @konjfuchie
This change in a plugin file shouldn’t be necessary, as this change will anyway get removed with the next plugin update.
As we recently took over this plugin, our developers will make a code audit and we’ll be able to provide a better solution for this.
Meanwhile, can you test if this is some kind of conflict with another theme/plugin?
First, create a recent backup in case you lose any settings during the test and have to restore to a previous working state.
Then deactivate all plugins and MU-plugins apart from Broken Link Checker, activate a default theme like TwentySeventeen, clear all caches and check again if the issue is still there. If not, it means that something is conflicting, so start activating the remaining plugins and theme, one by one this time, checking every time for the reported issue, until you reproduce the issue, thus finding the conflicted combination. The following flowchart image can assist you during this test: https://premium.wpmudev.org/wp-content/uploads/2015/09/Support-Process-Support-Process.gif
If this is a live website with traffic, I’d rather advise to create a staging environment, meaning a complete and exact copy of this installation into another location/folder in the same server, using a separate database, and perform the test in there instead without worrying about the live site.
Thank you,
Dimitris
