diff --git a/models/pull.go b/models/pull.go
index 2eb89d2e3..a8b86937a 100755
--- a/models/pull.go
+++ b/models/pull.go
@@ -407,7 +407,7 @@ func (pr *PullRequest) SetMerged() (bool, error) {
 		return false, fmt.Errorf("Issue.changeStatus: %v", err)
 	}
 
-	if _, err := sess.Where("id = ?", pr.ID).Cols("has_merged, status, merged_commit_id, merger_id, merged_unix").Update(pr); err != nil {
+	if _, err := sess.Where("id = ?", pr.ID).Cols("has_merged, status, merged_commit_id, merger_id, merged_unix, amount").Update(pr); err != nil {
 		return false, fmt.Errorf("Failed to update pr[%d]: %v", pr.ID, err)
 	}
 
diff --git a/models/repo.go b/models/repo.go
index 7cda4ce8a..bef634941 100755
--- a/models/repo.go
+++ b/models/repo.go
@@ -205,7 +205,7 @@ type Repository struct {
 
 	//blockchain
 	ContractAddress					string				`xorm:"INDEX"`
-	Balance							int64				`xorm:"NOT NULL DEFAULT 0"`
+	Balance							string				`xorm:"NOT NULL DEFAULT '0'"`
 	BlockChainStatus     			RepoBlockChainStatus 	`xorm:"NOT NULL DEFAULT 0"`
 
 	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
diff --git a/modules/auth/repo_form.go b/modules/auth/repo_form.go
index 96d99bfed..7d0e9b439 100755
--- a/modules/auth/repo_form.go
+++ b/modules/auth/repo_form.go
@@ -489,7 +489,7 @@ type MergePullRequestForm struct {
 	MergeTitleField   string
 	MergeMessageField string
 	ForceMerge        *bool `json:"force_merge,omitempty"`
-	BlockChainAmount  int	`binding:"Required"`
+	BlockChainAmount  int
 }
 
 // Validate validates the fields
diff --git a/routers/repo/pull.go b/routers/repo/pull.go
index 80864122a..8841e4755 100755
--- a/routers/repo/pull.go
+++ b/routers/repo/pull.go
@@ -816,6 +816,8 @@ func MergePullRequest(ctx *context.Context, form auth.MergePullRequestForm) {
 		return
 	}
 
+	pr.Amount = form.BlockChainAmount
+
 	if err = pull_service.Merge(pr, ctx.User, ctx.Repo.GitRepo, models.MergeStyle(form.Do), message); err != nil {
 		if models.IsErrInvalidMergeStyle(err) {
 			ctx.Flash.Error(ctx.Tr("repo.pulls.invalid_merge_option"))