PHP Fatal error: Unsupported operand types in httpdocs/sites/all/modules/location/location.module on line 1330

Hi,

Using feedapi with simplepie to make feed-items with geocoordinaties (latitude, longtitude). I got the following error:

PHP Fatal error: Unsupported operand types in httpdocs/sites/all/modules/location/location.module on line 1330, referer: http://www.example.nl/node/12050/map

Line 1330 of location says:
// Normalize coordinates.
while ($location['latitude'] > 90) {
$location['latitude'] -= 180; <= Line 1330
}
while ($location['latitude'] < -90) {
$location['latitude'] += 180;
}
while ($location['longitude'] > 180) {
$location['longitude'] -= 360;
}
while ($location['longitude'] < -180) {
$location['longitude'] += 360;
}

Can someone help me to correct this error please?

Thanks a lot in advance!
greetings,
Martijn