The logs message aren't filled correctly when some values are missing.

					// Check if there are more occurrences of % than

					// arguments, if there are we fill out the arguments

					// array. It doesn't matter if we add more arguments than

					// placeholders.

					$num_args = 0;

					if (!is_array($this->user->lang[$row['log_operation']]))

					{

						$num_args = substr_count($log[$i]['action'], '%');

					}

					else

					{

						foreach ($this->user->lang[$row['log_operation']] as $case => $plural_string)

						{

							$num_args = max($num_args, substr_count($plural_string, '%'));

						}

					}

$num_args = substr_count($this->user->lang[$row['log_operation']], '%');