diff --git a/src/main/scala/model/IssueComment.scala b/src/main/scala/model/IssueComment.scala
index 1084a33..f9fd983 100644
--- a/src/main/scala/model/IssueComment.scala
+++ b/src/main/scala/model/IssueComment.scala
@@ -9,9 +9,9 @@
   def content = column[String]("CONTENT")
   def registeredDate = column[java.util.Date]("REGISTERED_DATE")
   def updatedDate = column[java.util.Date]("UPDATED_DATE")
-  def * = userName ~ repositoryName ~ issueId ~ commentId ~ action.? ~ commentedUserName ~ content ~ registeredDate ~ updatedDate <> (IssueComment, IssueComment.unapply _)
+  def * = userName ~ repositoryName ~ issueId ~ commentId ~ action ~ commentedUserName ~ content ~ registeredDate ~ updatedDate <> (IssueComment, IssueComment.unapply _)
 
-  def autoInc = userName ~ repositoryName ~ issueId ~ action.? ~ commentedUserName ~ content ~ registeredDate ~ updatedDate returning commentId
+  def autoInc = userName ~ repositoryName ~ issueId ~ action ~ commentedUserName ~ content ~ registeredDate ~ updatedDate returning commentId
   def byPrimaryKey(commentId: Int) = this.commentId is commentId.bind
 }
 
@@ -20,7 +20,7 @@
     repositoryName: String,
     issueId: Int,
     commentId: Int,
-    action: Option[String],
+    action: String,
     commentedUserName: String,
     content: String,
     registeredDate: java.util.Date,
diff --git a/src/main/scala/service/IssuesService.scala b/src/main/scala/service/IssuesService.scala
index 17f3c69..395bcee 100644
--- a/src/main/scala/service/IssuesService.scala
+++ b/src/main/scala/service/IssuesService.scala
@@ -192,7 +192,7 @@
     IssueLabels filter(_.byPrimaryKey(owner, repository, issueId, labelId)) delete
 
   def createComment(owner: String, repository: String, loginUser: String,
-      issueId: Int, content: String, action: Option[String]) =
+      issueId: Int, content: String, action: String) =
     IssueComments.autoInc insert (
         owner,
         repository,
diff --git a/src/main/scala/servlet/GitRepositoryServlet.scala b/src/main/scala/servlet/GitRepositoryServlet.scala
index 55ce0e9..94c432b 100644
--- a/src/main/scala/servlet/GitRepositoryServlet.scala
+++ b/src/main/scala/servlet/GitRepositoryServlet.scala
@@ -85,7 +85,7 @@
             "(^|\\W)#(\\d+)(\\W|$)".r.findAllIn(commit.fullMessage).matchData.foreach { matchData =>
               val issueId = matchData.group(2)
               if(getAccountByUserName(commit.committer).isDefined && getIssue(owner, repository, issueId).isDefined){
-                createComment(owner, repository, commit.committer, issueId.toInt, commit.fullMessage, Some("commit"))
+                createComment(owner, repository, commit.committer, issueId.toInt, commit.fullMessage, "commit")
               }
             }
             Some(commit)