Increase {block}.title length to 255 characters.
function block_update_8003() {
db_change_field('block', 'title', 'title', array(
'type' => 'varchar',
'length' => 255,
'not null' => TRUE,
'default' => '',
'description' => 'Custom title for the block. (Empty string will use block default title, - None - will remove the title, text will cause block to use specified title.)',
));
}