white dots on render

im using one hdri for the environment and another hdri for reflection overide. in that case i get white dots on the render. when i uncheck the reflection overide hdri it renders fine
any solution ? corona bug ?

Yes, but fixed in Corona 8. Which version of Corona (and host software + version, and OS) are you using please?

using corona 7 hotfix 1, windows 10

Then Corona 8 should indeed be the solution, the fix there should take care of the problem. Thanks!