From 98525111f3cc83b1390d4c1c37ea19188fb323b5 Mon Sep 17 00:00:00 2001
From: Warren Holmes <warren.d.holmes@gmail.com>
Date: Mon, 17 Dec 2012 14:39:27 +0200
Subject: [PATCH] Check categories and tags are available on a product before
 doing count updates.

---
 woocommerce-core-functions.php | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/woocommerce-core-functions.php b/woocommerce-core-functions.php
index 27bc6380939..5ef4b0a997c 100644
--- a/woocommerce-core-functions.php
+++ b/woocommerce-core-functions.php
@@ -2011,15 +2011,25 @@ function woocommerce_recount_after_stock_change( $product_id ) {
 	$product_cats = $product_tags = array();
 
 	$product_terms = get_the_terms( $product_id, 'product_cat' );
-	foreach ( $product_terms as $term )
-		$product_cats[ $term->term_id ] = $term->parent;
+
+	if( count( $product_terms) ){
+
+		foreach ( $product_terms as $term )
+			$product_cats[ $term->term_id ] = $term->parent;
+
+	}
 
 	$product_terms = get_the_terms( $product_id, 'product_tag' );
-	foreach ( $product_terms as $term )
-		$product_tags[ $term->term_id ] = $term->parent;
 
-	_woocommerce_term_recount( $product_cats, get_taxonomy( 'product_cat' ), false, false );
-	_woocommerce_term_recount( $product_tags, get_taxonomy( 'product_tag' ), false, false );
+	if( count( $product_terms ) ){
+
+		foreach ( $product_terms as $term )
+			$product_tags[ $term->term_id ] = $term->parent;
+
+	}
+
+	if( count( $product_cats ) ) _woocommerce_term_recount( $product_cats, get_taxonomy( 'product_cat' ), false, false );
+	if( count( $product_cats ) ) _woocommerce_term_recount( $product_tags, get_taxonomy( 'product_tag' ), false, false );
 }
 
 add_action( 'woocommerce_product_set_stock_status', 'woocommerce_recount_after_stock_change' );