Added a check to avoid error when manipulating clocks with no active scene

module/blades-clock-sheet.js

@@ -58,7 +58,9 @@ export class BladesClockSheet extends BladesSheet {
         )
       );
     });
-    await TokenDocument.updateDocuments( data, { parent: game.scenes.current } )
+    if(game.scenes.current){
+      await TokenDocument.updateDocuments( data, { parent: game.scenes.current } )
+    }
 
     // Update the Actor
     return this.object.update(formData);