diff --git a/models/pull.go b/models/pull.go
index f86892cbfc92..94cb2a2a032d 100644
--- a/models/pull.go
+++ b/models/pull.go
@@ -35,6 +35,7 @@ const (
 	PullRequestStatusChecking
 	PullRequestStatusMergeable
 	PullRequestStatusManuallyMerged
+	PullRequestStatusError
 )
 
 // PullRequest represents relation between pull request and repositories.
@@ -513,7 +514,7 @@ func (pr *PullRequest) apiFormat(e Engine) *api.PullRequest {
 	}
 
 	if pr.Status != PullRequestStatusChecking {
-		mergeable := pr.Status != PullRequestStatusConflict && !pr.IsWorkInProgress()
+		mergeable := !(pr.Status == PullRequestStatusConflict || pr.Status == PullRequestStatusError) && !pr.IsWorkInProgress()
 		apiPullRequest.Mergeable = mergeable
 	}
 	if pr.HasMerged {
diff --git a/services/pull/check.go b/services/pull/check.go
index 74185b6815d4..055403d0df33 100644
--- a/services/pull/check.go
+++ b/services/pull/check.go
@@ -194,10 +194,16 @@ func TestPullRequests(ctx context.Context) {
 			if err != nil {
 				log.Error("GetPullRequestByID[%s]: %v", prID, err)
 				continue
+			} else if pr.Status != models.PullRequestStatusChecking {
+				continue
 			} else if manuallyMerged(pr) {
 				continue
 			} else if err = TestPatch(pr); err != nil {
 				log.Error("testPatch[%d]: %v", pr.ID, err)
+				pr.Status = models.PullRequestStatusError
+				if err := pr.UpdateCols("status"); err != nil {
+					log.Error("Unable to update status of pr %d: %v", pr.ID, err)
+				}
 				continue
 			}
 			checkAndUpdateStatus(pr)