@MartinK, I think I figured out the problem: First, I accidentally use volume button to change volume,but instead I change the zoom level to around 56. there is no map at this zoom level, so there was a http exception you catched this exception,however, the variable are not assigned, that's what the error show. So I fixed by change zoom level and also put line 1043 and 1044 before line 1042. Hope this helps