Bug? I kinda need help

I need help. i am a new construct 2 user, and whenever i try to preiview my "Paul the ghost shooter" game (I know its a corny title but whatever) it says this:

Javascript error!

Uncaught TypeError: Cannot set property

'hasCurrentMatMV' of null

http:localhost:50000/glwrap.js, line 550 (col 22)

This is likely a bug in Construct 2 or a third party plugin or behavior - please report it to the developer. Then it Says subsequent errors will be logged on to the console

I can only assume this is a bug cause it says so. can someone please help me?

Thanks,

ThePurplePig.

I don't know (maybe it is a safety feature). I ignore it and press everytime ok. It works.

...........................

Javascript error!

SecurityError: The operation is insecure.

localhost/preview_prelude.js, line 189 (col 0)

This is likely a bug in Construct 2 or a third party plugin or behavior - please report it to the developer. Subsequent errors will be logged to the console

Unless you follow the bug reporting guidelines, then this will likely be closed, as there is no way anyone can reproduce the error - and therefore fix it - without an example .capx and steps to reproduce.

Closing, please follow the bug report guidelines.