[Plugin: Register Plus] PHP 5 incompatibility

Hi all I’m getting the following error. My site is running perfectly except for this error:

Cannot use string offset as an array in <b>/home/asphere/public_html/wp-content/plugins/register-plus/register-plus.php</b> on line <b>1447

Any thoughts.

The offending line is:
if( $regplus[‘profile_req’][0] ) $profile_req = “, #” . implode(“, #”, $regplus[‘profile_req’]);