diff --git a/src/Producer/SyncProcess.php b/src/Producer/SyncProcess.php
index d09096f9..f5ff9c2a 100644
--- a/src/Producer/SyncProcess.php
+++ b/src/Producer/SyncProcess.php
@@ -125,7 +125,7 @@ protected function convertMessage($data)
             }
 
             if (! isset($value['value']) || ! trim($value['value'])) {
-                continue;
+                $value['value'] = null;
             }
 
             if (! isset($value['key'])) {