gistfile1.diff

diff --git a/plugins/node.d/snmp__swap.in b/plugins/node.d/snmp__swap.in
index 06c355f..de1d476 100644
--- a/plugins/node.d/snmp__swap.in
+++ b/plugins/node.d/snmp__swap.in
@@ -52,8 +52,12 @@ my $swapsize = 0;
 my $swapused = 0;
 
 foreach my $swap (keys %$swap_d) {
-    $swapsize += $session->get_single($hrStorageSize . $swap);
-    $swapused += $session->get_single($hrStorageUsed . $swap);
+    my $size = $session->get_single($hrStorageSize . $swap);
+    next unless $size ~ /^\d+$/;
+    my $used = $session->get_single($hrStorageUsed . $swap);
+    next unless $used ~ /^\d+$/;
+    $swapsize += $size;
+    $swapused += $used;
 }
 
 if (defined $ARGV[0] and $ARGV[0] eq "config") {