This is detected by our MachineLearning engine, which helps to protect even better against 0day threats. Unfortunately, as this is a heuristic engine, it's possible False Positives happen. Thanks for reporting these, as this helps to finetune the engine, so these won't be detected in the future anymore.
This should be fixed by now. Please give it some time (max 10 minutes) in order to have it populate, so detection won't happen anymore.
If still detected on your end after ~10 minutes from now. Perform the following steps:
Totally exit/shutdown Malwarebytes.
Go to here in explorer: C:\ProgramData\Malwarebytes\MBAMService
Delete the following file only: hubblecache
Then you can restart MBAM and the cache file will rebuild on the next scan.