Some RRD issue with the latest snapshot

[matrix200]

The memory RRD fails to render and the logs contain the following message :
php: /status_rrd_graph_img.php: Sorry we do not have data to graph for system-memory.rrd

followed by :

php: /status_rrd_graph_img.php: Failed to create graph with error code 0, the error is: Array

I double checked in the system.log itself and indeed the error message is cutoff like that (nothing after the Array word).