diff --git a/npm/ng-packs/packages/core/src/lib/utils/environment-utils.ts b/npm/ng-packs/packages/core/src/lib/utils/environment-utils.ts
index b8c182bcb4..47a8f18b42 100644
--- a/npm/ng-packs/packages/core/src/lib/utils/environment-utils.ts
+++ b/npm/ng-packs/packages/core/src/lib/utils/environment-utils.ts
@@ -33,6 +33,8 @@ function mergeEnvironments(
     case 'deepmerge':
       return new SetEnvironment(deepMerge(local, remote));
     case 'overwrite':
+    case null:
+    case undefined:
       return new SetEnvironment(remote);
     default:
       return new SetEnvironment(config.mergeStrategy(local, remote));