Strict Standards warning on line 308

I am testing the combined upgrades of WP 3.7.1 and the Advanced Custom Fields plugin v4.3.1.

I receive a debug warning when using a Relationship field with a custom post type:
Strict Standards: Only variables should be passed by reference in /Users/rob/Documents/wwwroot/awards.ixda.org/wp-content/plugins/custom-post-type-permalinks/custom-post-type-permalinks.php on line 308

The old line 308:

if( "%post_id%" == $parent_structure or "%post_id%" == array_pop( explode( "/", $parent_structure ) ) ) {

The new line that I edited to avoid error:

$tempVarOne = explode( "/", $parent_structure );
$tempVarTwo = array_pop( $tempVarOne );
if( "%post_id%" == $parent_structure or "%post_id%" == $tempVarTwo ) {

I know it isn’t pretty, but it works now.

Will this be addressed in a future update? Will this edit work long term? I’m only guessing at a fix here.

http://wordpress.org/plugins/custom-post-type-permalinks/