Better sanity check handling WordITerator

diff --git a/src/library/IndexDocumentBundle.php b/src/library/IndexDocumentBundle.php
index 9caa36b9b..3d1ddf5fa 100644
--- a/src/library/IndexDocumentBundle.php
+++ b/src/library/IndexDocumentBundle.php
@@ -1475,7 +1475,7 @@ class IndexDocumentBundle implements CrawlConstants
                 crawlLog("..Length posting string: " .
                     strlen($postings_string));
                 crawlLog("..Current position: " . $current_pos);
-                break;
+                return []; // sanity check 1
             }
             $int_info = ord($postings_string[$current_pos]);
             $current_pos++;
@@ -1487,7 +1487,7 @@ class IndexDocumentBundle implements CrawlConstants
                 crawlLog("..Length posting string: " .
                     strlen($postings_string));
                 crawlLog("..Current position: " . $current_pos);
-                break; //sanity check break
+                return []; // sanity check 2
             }
             $pre_item = unpack($unpack_map[$int_info], $postings_string,
                 $current_pos);
diff --git a/src/library/index_bundle_iterators/WordIterator.php b/src/library/index_bundle_iterators/WordIterator.php
index 7ddac6aa9..206d90661 100644
--- a/src/library/index_bundle_iterators/WordIterator.php
+++ b/src/library/index_bundle_iterators/WordIterator.php
@@ -989,10 +989,12 @@ class WordIterator extends IndexBundleIterator
                     $generation_info['POSTINGS_LEN']);
             }
         }
-        if (empty($postings_entry)) {
-            $postings = [];
-        } else {
-            list($postings,) = $index->unpackPostings($postings_entry);
+        $postings = [];
+        if (!empty($postings_entry)) {
+            $postings_info = $index->unpackPostings($postings_entry);
+            if (!empty($postings_info)) {
+                list($postings,) = $index->unpackPostings($postings_entry);
+            }
         }
         $this->dictionary_info[$generation]['POSTINGS'] = $postings;
         return $postings;