Catchable fatal error: Argument 1 passed to Runtastic\RuntasticActivityList::__construct() must be of the type array, null given

[Argurth]

Hi, first of all, thanks for the great works you've done by creating this project !

We are having this error for the account of one of our user. It's the only account who seems to raise this error at this time.

After, dumping some variables, it seems that the problem is that $responseOutputJson line 248 is getting a null value.

Do you have any idea why ?
Thanks a lot !