Index: uc_multi_stock.module
===================================================================
--- uc_multi_stock.module	(revision 4171)
+++ uc_multi_stock.module	(working copy)
@@ -258,25 +258,26 @@ function theme_uc_multi_stock_too_many_i
 // 	code from Inventory API & Simple Stock Levels
 //
 //	//////////////////////////////////////////////
-function uc_multi_get_sku($nid, $attributes)
-{
-	if (is_array($attributes) and count($attributes) > 0)
-	{
+function uc_multi_get_sku($nid, $attributes) {
+  // The default model should be the node's SKU ALL THE TIME
+  // There's a chance that a combination of attributes has the same SKU
+  // as the one, in which case, the combination will not be found but we still
+  // have to return the proper SKU, which should default to the node's SKU
+  $product = node_load($nid);
+  $model = $product->model;
+
+  if (is_array($attributes) and count($attributes) > 0) {
 		// There are attributes so the model (SKU) is dependant on the combo of
 		// attributes, so get all the sub products and find the attribute combo
 		// to match what we've been passed
-		foreach(uc_multi_get_subproducts($nid) as $product)
-			if(_uc_array_same($product['attributes'], $attributes))
-				return  $product['model'];
+    foreach(uc_multi_get_subproducts($nid) as $product) {
+      if(_uc_array_same($product['attributes'], $attributes)) {
+        $model = $product['model'];
 	}
-	else
-	{
-		// NO attributes so get SKU from the products node
-		$product = node_load($nid);
-
-		return $product->model;
 	}
-	return false;
+  }
+
+  return $model;
 }
 
 /**