mPDF error: IMAGE Error (https://maps.googleapis.com/maps/api/staticmap?center=Hnězdenská%20735/,%20181%2000%20Praha&zoom=14&size=400x300&markers=color:black%7CHnězdenská%20735/,%20181%2000%20Praha): Error parsing image file - image type not recognised, and not supported by GD imagecreate