Warning produced when trying to copy a group page

A warning message is produced when trying to copy a group page from the "Administer Groups" page.

[WAR] 84 (lib/adodb/adodb-exceptions.inc.php:45) Array to string conversion
Call stack (most recent first):

    log_message("Array to string conversion", 8, true, true, "/home/lisaseeto/code/mahara/htdocs/lib/adodb/adodb...", 45) at /home/lisaseeto/code/mahara/htdocs/lib/errors.php:521
    error(8, "Array to string conversion", "/home/lisaseeto/code/mahara/htdocs/lib/adodb/adodb...", 45, array(size 7)) at /home/lisaseeto/code/mahara/htdocs/lib/adodb/adodb-exceptions.inc.php:45
    ADODB_Exception->__construct("postgres8", "adodb_throw", -1, "ERROR: update or delete on table "block_instance"...", "DELETE FROM "block_instance" WHERE "view" = ? ", array(size 1), object(ADODB_postgres8)) at /home/lisaseeto/code/mahara/htdocs/lib/adodb/adodb-exceptions.inc.php:80
    adodb_throw("postgres8", "adodb_throw", -1, "ERROR: update or delete on table "block_instance"...", "DELETE FROM "block_instance" WHERE "view" = ? ", array(size 1), object(ADODB_postgres8)) at /home/lisaseeto/code/mahara/htdocs/lib/adodb/adodb.inc.php:310
    ADODB_TransMonitor("postgres8", "adodb_throw", -1, "ERROR: update or delete on table "block_instance"...", "DELETE FROM "block_instance" WHERE "view" = ? ", array(size 1), object(ADODB_postgres8)) at /home/lisaseeto/code/mahara/htdocs/lib/adodb/adodb.inc.php:1281
    ADOConnection->_Execute("DELETE FROM "block_instance" WHERE "view" = ? ", array(size 1)) at /home/lisaseeto/code/mahara/htdocs/lib/adodb/adodb.inc.php:1241
    ADOConnection->Execute("DELETE FROM "block_instance" WHERE "view" = ? ", array(size 1)) at /home/lisaseeto/code/mahara/htdocs/lib/dml.php:1041
    delete_records("block_instance", "view", "54") at /home/lisaseeto/code/mahara/htdocs/lib/group.php:3121
    group_copy(1, "adminlist") at /home/lisaseeto/code/mahara/htdocs/group/copy.php:42

[WAR] 84 (lib/errors.php:859) Failed to get a recordset: postgres8 error: [-1: ERROR: update or delete on table "block_instance" violates foreign key constraint "blocinstdime_blo_fk" on table "block_instance_dimension"
DETAIL: Key (id)=(219) is still referenced from table "block_instance_dimension".] in adodb_throw(DELETE FROM "block_instance" WHERE "view" = ? , Array)Command was: DELETE FROM "block_instance" WHERE "view" = ? and values was (0:54)

Steps:
Have a site with at least one group. Log in as admin
1/ From main menu select Groups -> Administer Groups
2/ In the list select "Copy"
Expected results:
You are able to continue the copying a page process
Actual results:
A warning message is produced (see attachment)