This action can cause unexpected behavior on webpages designed primarily for IE8. There are a couple of ways to work around the issue. One simple JS fix is to replace the onclick call to something like this:
onclick="this.disabled=true; /*Do Required operation*/ return false;"
Other options include, using a js listener to catch the click event and prevent it from double clicking.
Also changing the type of the button from “Submit” to Button apparently reduces the probability of this error recurring.