pkg/config: support null values

2 files changed, 6 insertions, 1 deletions

diff --git a/pkg/config/config.go b/pkg/config/config.go
index 03d4b283e..b31399713 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -63,7 +63,7 @@ func checkUnknownFieldsRec(data []byte, prefix string, typ reflect.Type) error {
 		if !ok {
 			return fmt.Errorf("unknown field '%v%v' in config", prefix, k)
 		}
-		if field.Kind() == reflect.Slice &&
+		if v != nil && field.Kind() == reflect.Slice &&
 			(field.PkgPath() != "encoding/json" || field.Name() != "RawMessage") {
 			vv := reflect.ValueOf(v)
 			if vv.Type().Kind() != reflect.Slice {
diff --git a/pkg/config/config_test.go b/pkg/config/config_test.go
index 79836f39e..ee8a79661 100644
--- a/pkg/config/config_test.go
+++ b/pkg/config/config_test.go
@@ -157,6 +157,11 @@ func TestLoad(t *testing.T) {
 			},
 			"",
 		},
+		{
+			`{"foo": null, "qux": null}`,
+			Config{},
+			"",
+		},
 	}
 	for i, test := range tests {
 		t.Run(fmt.Sprint(i), func(t *testing.T) {