JI-942 Fix input clean

locallib.php

@@ -342,8 +342,8 @@ function hvp_content_upgrade_progress($libraryid) {
     if ($skipped !== null) {
         $out->skipped = json_decode($skipped);
         // Clean up input, only numbers.
-        foreach ($skipped as $i => $id) {
-            $skipped[$i] = intval($id);
+        foreach ($out->skipped as $i => $id) {
+            $out->skipped[$i] = intval($id);
         }
         $skipped = implode(',', $out->skipped);
     } else {