diff --git a/centreon-plugins/centreon/common/protocols/jmx/custom/jolokia.pm b/centreon-plugins/centreon/common/protocols/jmx/custom/jolokia.pm
index d2dfaca51..fb1f83915 100644
--- a/centreon-plugins/centreon/common/protocols/jmx/custom/jolokia.pm
+++ b/centreon-plugins/centreon/common/protocols/jmx/custom/jolokia.pm
@@ -292,7 +292,8 @@ sub list_attributes {
                         $v =~ s/^\s*//;
                         print " = " . $v;
                     } else {
-                        if (my $scal = JMX::Jmx4Perl::Util->dump_scalar($val)) {
+                        my $scal = JMX::Jmx4Perl::Util->dump_scalar($val);
+                        if (defined($scal)) {
                             print " = " . $scal . "\n";
                         } else {
                             print " = undef\n";
@@ -367,4 +368,4 @@ Credentials to use for the target
 
 B<custom>.
 
-=cut
\ No newline at end of file
+=cut