diff --git a/pandora_server/ChangeLog b/pandora_server/ChangeLog
index 7e7ed108e7..f6d7c755ea 100644
--- a/pandora_server/ChangeLog
+++ b/pandora_server/ChangeLog
@@ -1,3 +1,7 @@
+2010-12-27  Sancho Lerena <slerena@artica.es>
+
+	* util/pandora_sync_db.pl: Fixed a undefined condition.
+
 2010-12-22  Sergio Martin <sergio.martin@artica.es>
 
 	*  util/pandora_manage.pl: Fixed duplicate module creation
diff --git a/pandora_server/util/pandora_sync_db.pl b/pandora_server/util/pandora_sync_db.pl
index 52edbd3481..ac0f4adc82 100755
--- a/pandora_server/util/pandora_sync_db.pl
+++ b/pandora_server/util/pandora_sync_db.pl
@@ -73,7 +73,12 @@ print "\n[*] $agents_deleted agents deleted on destination.\n" unless $agents_de
 print "\n[*] Preparing modules correlation.\n";
 
 my $id_agentmodule_comparation = enterprise_hook('sync_compare_id_agent_modules', [$dbh_source, $dbh_dest, $id_agent_comparation, \$errors_modules]);
-my @id_agentmodule_comparation = @{$id_agentmodule_comparation};
+
+my @id_agentmodule_comparation;
+if ($id_agentmodule_comparation ne ""){
+	@id_agentmodule_comparation = @{$id_agentmodule_comparation};
+} 
+
 
 print "\n[*] Checking destination modules missed on source.\n";
 my $modules_deleted = enterprise_hook('sync_delete_dst_missed_agent_modules', [$dbh_source, $dbh_dest, $id_agent_comparation, \$errors_modules]);