diff --git a/engine/api/purge/purge_run.go b/engine/api/purge/purge_run.go
index 47b556711b..c5f12d0873 100644
--- a/engine/api/purge/purge_run.go
+++ b/engine/api/purge/purge_run.go
@@ -30,13 +30,14 @@ const (
 	RunStatus          = "run_status"
 	RunDaysBefore      = "run_days_before"
 	RunGitBranchExist  = "git_branch_exist"
+	RunChangeExist     = "gerrit_change_exist"
 	RunChangeMerged    = "gerrit_change_merged"
 	RunChangeAbandoned = "gerrit_change_abandoned"
 	RunChangeDayBefore = "gerrit_change_days_before"
 )
 
 func GetRetetionPolicyVariables() []string {
-	return []string{RunDaysBefore, RunStatus, RunGitBranchExist, RunChangeMerged, RunChangeAbandoned, RunChangeDayBefore}
+	return []string{RunDaysBefore, RunStatus, RunGitBranchExist, RunChangeMerged, RunChangeAbandoned, RunChangeDayBefore, RunChangeExist}
 }
 
 func markWorkflowRunsToDelete(ctx context.Context, store cache.Store, db *gorp.DbMap, workflowRunsMarkToDelete *stats.Int64Measure) error {
@@ -198,11 +199,17 @@ func purgeComputeVariables(ctx context.Context, luaCheck *luascript.Check, run s
 	if changeID, ok := vars["gerrit.change.id"]; ok && vcsClient != nil {
 		ch, err := vcsClient.PullRequest(ctx, app.RepositoryFullname, changeID)
 		if err != nil {
-			return err
+			if !sdk.ErrorIs(err, sdk.ErrNotFound) {
+				return err
+			}
+			vars[RunChangeExist] = "false"
+		} else {
+			vars[RunChangeExist] = "true"
+			vars[RunChangeMerged] = strconv.FormatBool(ch.Merged)
+			vars[RunChangeAbandoned] = strconv.FormatBool(ch.Closed)
+			varsFloats[RunChangeDayBefore] = math.Floor(time.Now().Sub(ch.Updated).Hours())
 		}
-		vars[RunChangeMerged] = strconv.FormatBool(ch.Merged)
-		vars[RunChangeAbandoned] = strconv.FormatBool(ch.Closed)
-		varsFloats[RunChangeDayBefore] = math.Floor(time.Now().Sub(ch.Updated).Hours())
+
 	}
 
 	// If we have a branch in payload, check if it exists on repository branches list
diff --git a/engine/vcs/gerrit/client_pull_request.go b/engine/vcs/gerrit/client_pull_request.go
index 42f187a6f2..12d49e726d 100644
--- a/engine/vcs/gerrit/client_pull_request.go
+++ b/engine/vcs/gerrit/client_pull_request.go
@@ -2,6 +2,7 @@ package gerrit
 
 import (
 	"context"
+	"net/http"
 
 	"github.com/andygrunwald/go-gerrit"
 
@@ -12,8 +13,11 @@ import (
 
 // PullRequest Get a gerrit change
 func (c *gerritClient) PullRequest(_ context.Context, _ string, id string) (sdk.VCSPullRequest, error) {
-	change, _, err := c.client.Changes.GetChange(id, nil)
+	change, resp, err := c.client.Changes.GetChange(id, nil)
 	if err != nil {
+		if resp != nil && resp.StatusCode == http.StatusNotFound {
+			return sdk.VCSPullRequest{}, sdk.WrapError(sdk.ErrNotFound, "unable to find change %s", id)
+		}
 		return sdk.VCSPullRequest{}, sdk.WithStack(err)
 	}
 	if change == nil {