PHP error on saving workout to library

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: NP

Filename: StressScore/MY_BikeScore.php

Line Number: 75

Backtrace:

File: /home2/recordde/public_html/application/libraries/StressScore/MY_BikeScore.php
Line: 75
Function: _error_handler

File: /home2/recordde/public_html/application/controllers/Plan.php
Line: 574
Function: speed_from_power

File: /home2/recordde/public_html/application/controllers/Plan.php
Line: 601
Function: _workout_parse

File: /home2/recordde/public_html/application/controllers/Plan.php
Line: 210
Function: run

File: /home2/recordde/public_html/index.php
Line: 316
Function: require_once
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