fixed an 'uninitialized' warning

diff --git a/selfforum-cgi/shared/Id.pm b/selfforum-cgi/shared/Id.pm
index 22535a20bc4ff605b8160d36f4aee3eff5320f39..8e9137920b377dfe2b049ce63147e24f09721206 100644 (file)
--- a/selfforum-cgi/shared/Id.pm
+++ b/selfforum-cgi/shared/Id.pm
@@ -66,6 +66,8 @@ sub unique_id () {
 #
 sub to_base64 ($) {
   my $x = shift;
+  return '' unless defined $x;
+
   my $y = $table[$x % 64];
 
   $y = $table[$x % 64].$y while ($x = int ($x/64));