Sync up issue on WordPress 4.9.4

[7DevendraYadav]

Do not sync through this exception on the console.

script.js?ver=1.5:1002 Uncaught TypeError: Cannot read property 'length' of null
at migrate_table_recursive (script.js?ver=1.5:1002)
at execute_next_step (script.js?ver=1.5:2307)
at Object.success (script.js?ver=1.5:1187)
at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-slider,underscore,shortcode,moxiejs,p&load[]=lupload&ver=4.9.4:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-slider,underscore,shortcode,moxiejs,p&load[]=lupload&ver=4.9.4:2)
at y (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-slider,underscore,shortcode,moxiejs,p&load[]=lupload&ver=4.9.4:4)
at XMLHttpRequest.c (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-slider,underscore,shortcode,moxiejs,p&load[]=lupload&ver=4.9.4:4)