i am facing $A.getCallback() [Cannot read property 'style' of null] Error after upgrading my sandbox to spring 21.

Code block:

//To set the horizontal scroll bar at bottom 
if(totalrec.length < 15){            
   document.getElementById("Table").style.height = totalrec.length+5;
}
else
{
    document.getElementById("Table").style.height = "auto";
}

Above code block is working fine till winter 21 upgrade. Please suggest solution for this.