fix buildkit pull nil panic
@@ -151,7 +151,7 @@ func (is *Source) ResolveImageConfig(ctx context.Context, ref string, opt llb.Re
case source.ResolveModePreferLocal:
img, err := is.resolveLocal(ref)
if err == nil {
- if !platformMatches(img, opt.Platform) {
+ if opt.Platform != nil && !platformMatches(img, opt.Platform) {
logrus.WithField("ref", ref).Debugf("Requested build platform %s does not match local image platform %s, checking remote",
path.Join(opt.Platform.OS, opt.Platform.Architecture, opt.Platform.Variant),
path.Join(img.OS, img.Architecture, img.Variant),
