Yes, I am pretty sure. This code:

print STDERR "\nNetwork $r[0], mask $r[1]\n";
my $scanner = new Nmap::Scanner;
my $results;
print STDERR "Start Scan\n";
eval{ $results = $scanner->scan("-v -sP $r[0]/$r[1]"); };
print STDERR "Error catched: $@\n" if($@);
print STDERR "Scan complete\n";
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Yeilds this output:

Network xx.xx.xx.xx, mask yy
Start Scan
Scan complete

Network 10.8.165.160, mask 28
Start Scan
<nmap-error>
  <pid="18142"/>
  <cmdline="'/usr/bin/nmap' -v -v -v -v -sP 10.8.165.160/28 -oX -"/>
  <nmap-err>RTTVAR has grown to over 2.3 seconds, decreasing to 2.0
</nmap-msg>
</nmap-error>
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ie the two last prints are not executed