diff --git a/Plugins/NativeGallery/Editor/NGPostProcessBuild.cs b/Plugins/NativeGallery/Editor/NGPostProcessBuild.cs
index 27c2ccf..8595eb5 100644
--- a/Plugins/NativeGallery/Editor/NGPostProcessBuild.cs
+++ b/Plugins/NativeGallery/Editor/NGPostProcessBuild.cs
@@ -136,8 +136,10 @@ public static void OnPostprocessBuild( BuildTarget target, string buildPath )
 				plist.ReadFromString( File.ReadAllText( plistPath ) );
 
 				PlistElementDict rootDict = plist.root;
-				rootDict.SetString( "NSPhotoLibraryUsageDescription", Settings.Instance.PhotoLibraryUsageDescription );
-				rootDict.SetString( "NSPhotoLibraryAddUsageDescription", Settings.Instance.PhotoLibraryAdditionsUsageDescription );
+				if( !string.IsNullOrEmpty( Settings.Instance.PhotoLibraryUsageDescription ) )
+					rootDict.SetString( "NSPhotoLibraryUsageDescription", Settings.Instance.PhotoLibraryUsageDescription );
+				if( !string.IsNullOrEmpty( Settings.Instance.PhotoLibraryAdditionsUsageDescription ) )
+					rootDict.SetString( "NSPhotoLibraryAddUsageDescription", Settings.Instance.PhotoLibraryAdditionsUsageDescription );
 				if( Settings.Instance.DontAskLimitedPhotosPermissionAutomaticallyOnIos14 )
 					rootDict.SetBoolean( "PHPhotoLibraryPreventAutomaticLimitedAccessAlert", true );