diff --git a/src/main/scala/gitbucket/core/service/MergeService.scala b/src/main/scala/gitbucket/core/service/MergeService.scala
index 166b64a..061b2a6 100644
--- a/src/main/scala/gitbucket/core/service/MergeService.scala
+++ b/src/main/scala/gitbucket/core/service/MergeService.scala
@@ -216,7 +216,7 @@
         throw new RuntimeException("This pull request can't merge automatically.")
       }
       val mergeResultCommit = parseCommit(Option(repository.resolve(mergedBranchName)).getOrElse {
-        throw new RuntimeException(s"not found branch ${mergedBranchName}")
+        throw new RuntimeException(s"Not found branch ${mergedBranchName}")
       })
       // creates merge commit
       val mergeCommitId = createMergeCommit(mergeResultCommit.getTree().getId(), committer, message)
@@ -295,7 +295,7 @@
   private def createConflictMessage(mergeTip: ObjectId, mergeBaseTip: ObjectId, merger: Merger): String = {
     val mergeResults = merger.asInstanceOf[RecursiveMerger].getMergeResults
 
-    s"can't merge ${mergeTip.name} into ${mergeBaseTip.name}\n\n" +
+    s"Can't merge ${mergeTip.name} into ${mergeBaseTip.name}\n\n" +
       "Conflicting files:\n" +
       mergeResults.asScala.map { case (key, _) => "- " + key + "\n" }.mkString
   }
diff --git a/src/test/scala/gitbucket/core/service/MergeServiceSpec.scala b/src/test/scala/gitbucket/core/service/MergeServiceSpec.scala
index e8db486..18d9e52 100644
--- a/src/test/scala/gitbucket/core/service/MergeServiceSpec.scala
+++ b/src/test/scala/gitbucket/core/service/MergeServiceSpec.scala
@@ -32,7 +32,7 @@
       val repo1Dir = initRepository("user1","repo1")
       assert(service.checkConflictCache("user1", "repo1", branch, issueId) == None)
       val conflicted = service.checkConflict("user1", "repo1", branch, issueId)
-      assert(service.checkConflictCache("user1", "repo1", branch, issueId) == Some(false))
+      assert(service.checkConflictCache("user1", "repo1", branch, issueId) == Some(None))
       assert(conflicted.isEmpty)
     }
     it("checkConflict true if not conflicted, and create cache") {
@@ -43,14 +43,17 @@
       assert(service.checkConflictCache("user1", "repo2", branch, issueId) == None)
       val conflicted = service.checkConflict("user1", "repo2", branch, issueId)
       assert(conflicted.isDefined)
-      assert(service.checkConflictCache("user1", "repo2", branch, issueId) == Some(true))
+      assert(service.checkConflictCache("user1", "repo2", branch, issueId) match {
+        case Some(Some(_: String)) => true
+        case _ => false
+      })
     }
   }
   describe("checkConflictCache") {
     it("merged cache invalid if origin branch moved") {
       val repo3Dir = initRepository("user1","repo3")
-      assert(service.checkConflict("user1", "repo3", branch, issueId) == false)
-      assert(service.checkConflictCache("user1", "repo3", branch, issueId) == Some(false))
+      assert(service.checkConflict("user1", "repo3", branch, issueId).isEmpty)
+      assert(service.checkConflictCache("user1", "repo3", branch, issueId) == Some(None))
       using(Git.open(repo3Dir)){ git =>
         createFile(git, s"refs/heads/${branch}", "test.txt", "hoge2" )
       }
@@ -58,8 +61,8 @@
     }
     it("merged cache invalid if request branch moved") {
       val repo4Dir = initRepository("user1","repo4")
-      assert(service.checkConflict("user1", "repo4", branch, issueId) == false)
-      assert(service.checkConflictCache("user1", "repo4", branch, issueId) == Some(false))
+      assert(service.checkConflict("user1", "repo4", branch, issueId).isEmpty)
+      assert(service.checkConflictCache("user1", "repo4", branch, issueId) == Some(None))
       using(Git.open(repo4Dir)){ git =>
         createFile(git, s"refs/pull/${issueId}/head", "test.txt", "hoge4" )
       }
@@ -67,8 +70,8 @@
     }
     it("should merged cache invalid if origin branch moved") {
       val repo5Dir = initRepository("user1","repo5")
-      assert(service.checkConflict("user1", "repo5", branch, issueId) == false)
-      assert(service.checkConflictCache("user1", "repo5", branch, issueId) == Some(false))
+      assert(service.checkConflict("user1", "repo5", branch, issueId).isEmpty)
+      assert(service.checkConflictCache("user1", "repo5", branch, issueId) == Some(None))
       using(Git.open(repo5Dir)){ git =>
         createFile(git, s"refs/heads/${branch}", "test.txt", "hoge2" )
       }
@@ -79,8 +82,11 @@
       using(Git.open(repo6Dir)){ git =>
         createConfrict(git)
       }
-      assert(service.checkConflict("user1", "repo6", branch, issueId) == true)
-      assert(service.checkConflictCache("user1", "repo6", branch, issueId) == Some(true))
+      assert(service.checkConflict("user1", "repo6", branch, issueId).isDefined)
+      assert(service.checkConflictCache("user1", "repo6", branch, issueId) match {
+        case Some(Some(_: String)) => true
+        case _ => false
+      })
       using(Git.open(repo6Dir)){ git =>
         createFile(git, s"refs/pull/${issueId}/head", "test.txt", "hoge4" )
       }
@@ -91,8 +97,11 @@
       using(Git.open(repo7Dir)){ git =>
         createConfrict(git)
       }
-      assert(service.checkConflict("user1", "repo7", branch, issueId) == true)
-      assert(service.checkConflictCache("user1", "repo7", branch, issueId) == Some(true))
+      assert(service.checkConflict("user1", "repo7", branch, issueId).isDefined)
+      assert(service.checkConflictCache("user1", "repo7", branch, issueId) match {
+        case Some(Some(_)) => true
+        case _ => false
+      })
       using(Git.open(repo7Dir)){ git =>
         createFile(git, s"refs/heads/${branch}", "test.txt", "hoge4" )
       }