diff --git a/src/main/scala/gitbucket/core/service/WebHookService.scala b/src/main/scala/gitbucket/core/service/WebHookService.scala
index 06efce9..e5436f6 100644
--- a/src/main/scala/gitbucket/core/service/WebHookService.scala
+++ b/src/main/scala/gitbucket/core/service/WebHookService.scala
@@ -204,6 +204,7 @@
       case _ if before.filterNot(_=='0').isEmpty => ApiPath(s"/${repository.full_name}/compare/${commits.head.id}^...${after}")
       case _ => ApiPath(s"/${repository.full_name}/compare/${before}...${after}")
     }
+    val head_commit = commits.lastOption
   }
 
   object WebHookPushPayload {