diff --git a/cmd/util/confighelpers/configuration.go b/cmd/util/confighelpers/configuration.go
index 46b49ff014..55c9ec330f 100644
--- a/cmd/util/confighelpers/configuration.go
+++ b/cmd/util/confighelpers/configuration.go
@@ -274,7 +274,7 @@ func stringToSliceDurationHookFunc(sep string) mapstructure.DecodeHookFunc {
 			return data, nil
 		}
 
-		raw := data.(string)
+		raw, _ := data.(string)
 		if raw == "" {
 			return []time.Duration{}, nil
 		}