diff --git a/services/pull/pull.go b/services/pull/pull.go
index a5541b8460..73d7c57148 100644
--- a/services/pull/pull.go
+++ b/services/pull/pull.go
@@ -294,6 +294,10 @@ func AddTestPullRequestTask(doer *user_model.User, repoID int64, branch string,
 			}
 			if err == nil {
 				for _, pr := range prs {
+					if pr.Issue.IsClosed {
+						// The closed PR never trigger action or webhook
+						continue
+					}
 					if newCommitID != "" && newCommitID != git.EmptySHA {
 						changed, err := checkIfPRContentChanged(ctx, pr, oldCommitID, newCommitID)
 						if err != nil {