Bugfix when value is null (#155)

Author: Nyholm

Changelog.md

@@ -4,6 +4,12 @@ The change log describes what is "Added", "Removed", "Changed" or "Fixed" betwee
 
 ## UNRELEASED
 
+## 0.5.1
+
+### Fixed
+
+* Bug on `TaggablePSR6ItemAdapter::isItemCreatedHere` where item value was `null`.
+
 ## 0.5.0
 
 ### Added

TaggablePSR6ItemAdapter.php

@@ -230,6 +230,6 @@ private function initializeTags()
      */
     private function isItemCreatedHere($rawItem)
     {
-        return is_array($rawItem) && isset($rawItem['value']) && isset($rawItem['tags']) && count($rawItem) === 2;
+        return is_array($rawItem) && array_key_exists('value', $rawItem) && array_key_exists('tags', $rawItem) && count($rawItem) === 2;
     }
 }