diff --git a/plugins/network/bandwidth_ b/plugins/network/bandwidth_
index 99a4fc39..1ceda5e6 100755
--- a/plugins/network/bandwidth_
+++ b/plugins/network/bandwidth_
@@ -75,7 +75,7 @@ my $count30  = 2592000;      # The number of seconds in 30 days
 my $unix_ts  = time;
 my $rollover = 4294967295;
 
-eval { init(); };
+init();
 
 sub autoconf {
     $0 =~ /bandwidth_(.+)*$/;
@@ -263,6 +263,7 @@ sub sum_old {
 
 sub munin_output {
     my $period    = $unix_ts - $oldest_ts;
+    return unless $period;  #can't estimate anything from a single point, so don't.
     my $total30   = $input_30days + $output_30days;
     my $average30 = $total30 / $period;
     print "average.value  $average30\n";