Thread:Extension talk:CharInsert/White screen after editing localsettings

After uploading the files, when I put the code in localettings.php, I lose connection to my wiki - I just get a white screen. Removing the code again restores things to normal.

It's only this extension I've had this problem with. (I installed a different extension just now, to make sure, and had no problems with that one.)

Any thoughts?