Fix nil pointer deref during diff attempt

Signed-off-by: Hidde Beydals <[email protected]>

Author: hiddeco

internal/controllers/helmrelease_controller.go

@@ -23,7 +23,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/hashicorp/go-retryablehttp"
 	"helm.sh/helm/v3/pkg/chart"
 	"helm.sh/helm/v3/pkg/chartutil"
 	"helm.sh/helm/v3/pkg/storage/driver"
@@ -329,7 +328,7 @@ func (r *HelmReleaseReconciler) reconcileRelease(ctx context.Context,
 	hr, hasNewState := v2.HelmReleaseAttempted(hr, revision, releaseRevision, valuesChecksum)
 
 	// Run diff against current cluster state.
-	if !hasNewState {
+	if !hasNewState && rel != nil {
 		if ok, _ := features.Enabled(features.DetectDrift); ok {
 			differ := diff.NewDiffer(runtimeClient.NewImpersonator(
 				r.Client,