"warning: Invalid argument supplied for foreach()...civicrm/CRM/Contribute/BAO/Contribution.php on line 1439." when modifying a contribution

We are seeing the following error when modifying existing contributions:

"warning: Invalid argument supplied for foreach() in /home/www/drupal/sites/mydomain.org/modules/civicrm/CRM/Contribute/BAO/Contribution.php on line 1439."

the error seems to occur nearly every time a transaction record is edited. the changes are saved just fine, but the error is displayed to the user.

eileen says: looks like that line of code needs an if(is_array) around it, and provides this, via pastebin http://pastebin.com/bp0NW2fJ

Index: CRM/Contribute/BAO/Contribution.php
===================================================================
— CRM/Contribute/BAO/Contribution.php (revision 36508)
+++ CRM/Contribute/BAO/Contribution.php (working copy)
@@ -1460,7 +1460,8 @@
if ( $processContributionObject ) $processContribution = true;
}
} else if ( $contributionStatusId == array_search( 'Failed', $contributionStatuses ) ) {

• foreach ($memberships as $membership) {
  + if(is_array($memberships)){
  + foreach ($memberships as $membership) {
  if ( $membership ) { $membership->status_id = array_search( 'Expired', $membershipStatuses ); $membership->save( ); @@ -1469,6 +1470,7 @@ if ( $processContributionObject ) $processContribution = true; }

+ }
}
if ( $participant ) {
$updatedStatusId = array_search( 'Cancelled', $participantStatuses );