diff --git a/http/task_service.go b/http/task_service.go
index 1e2f5b8d3f..75d40a3636 100644
--- a/http/task_service.go
+++ b/http/task_service.go
@@ -560,17 +560,17 @@ func decodeGetRunsRequest(ctx context.Context, r *http.Request, orgs platform.Or
 		req.filter.Limit = i
 	}
 
+	var at, bt string
 	var afterTime, beforeTime time.Time
-	if at := qp.Get("afterTime"); at != "" {
+	if at = qp.Get("afterTime"); at != "" {
 		afterTime, err = time.Parse(time.RFC3339, at)
 		if err != nil {
 			return nil, err
 		}
 		req.filter.AfterTime = at
-
 	}
 
-	if bt := qp.Get("beforeTime"); bt != "" {
+	if bt = qp.Get("beforeTime"); bt != "" {
 		beforeTime, err = time.Parse(time.RFC3339, bt)
 		if err != nil {
 			return nil, err
@@ -578,7 +578,7 @@ func decodeGetRunsRequest(ctx context.Context, r *http.Request, orgs platform.Or
 		req.filter.BeforeTime = bt
 	}
 
-	if &afterTime != nil && &beforeTime != nil && afterTime.Sub(beforeTime).Nanoseconds() > 0 {
+	if at != "" && bt != "" && afterTime.Sub(beforeTime).Nanoseconds() > 0 {
 		return nil, kerrors.InvalidDataf("beforeTime must be greater than afterTime")
 	}