class-core.php

<?php
function upgrade_3_5_2b2() { //line 625
	// fixing the effects of a previous bug affecting non-MyISAM users
	if ( is_null( yarpp_get_option('weight') ) ||    //<-- this is one point where it errors out
		!is_array( yarpp_get_option('weight') ) ) {
		$weight = $this->default_options['weight'];
		// if we're still not using MyISAM
		if ( !yarpp_get_option('myisam_override') &&
			$this->myisam_check() !== true ) {
			unset( $weight['title'] );
			unset( $weight['body'] );
		}
		yarpp_set_option(array('weight' => $weight));
	}
}

fix.patch

diff --git a/class-core.php b/class-core_new.php
index d71ea77..39d6e32 100755
--- a/class-core.php
+++ b/class-core.php
@@ -624,16 +624,16 @@ class YARPP {
        
        function upgrade_3_5_2b2() {
                // fixing the effects of a previous bug affecting non-MyISAM users
-               if ( is_null( yarpp_get_option('weight') ) ||
-                       !is_array( yarpp_get_option('weight') ) ) {
+               if ( is_null( $this->get_option('weight') ) ||
+                       !is_array( $this->get_option('weight') ) ) {
                        $weight = $this->default_options['weight'];
                        // if we're still not using MyISAM
-                       if ( !yarpp_get_option('myisam_override') && 
+                       if ( !$this->get_option('myisam_override') && 
                                $this->diagnostic_myisam_posts() !== true ) {
                                unset( $weight['title'] );
                                unset( $weight['body'] );
                        }
-                       yarpp_set_option(array('weight' => $weight));
+                       $this->set_option(array('weight' => $weight));
                }
        }