refreshing MinimWatch with an invalid subnet crashes

[winxi]

Hi, I recently set up MinimServer in a new network environment and came across the following MinimWatch crash:
1) Start MinimWatch with an invalid ohnet.subnet property set. MinimWatch will show the red icon with a 'subnet not found'- message, as expected.
2) Click 'Refresh'. MinimWatch will crash with a NullPointerException.