FlightGear nil error

As I started doing FG Nasal programming, I noticed this in the fgrun console:

Nasal runtime error: nil used in numeric context at C:/Program Files/FlightGear 2.10.0.3/data/Aircraft/777/Nasal/warnsystem.nas , line 133 called from: C:/Program Files/FlightGear 2.10.0.3/data/Aircraft/777/Nasal/warn system.nas, line 407 called from: C:/Program Files/FlightGear 2.10.0.3/data/Aircraft/777/Nasal/warn system.nas, line 443

I don't think this affects anything. I just fixed it to clean up the console output. My fix as in C:\Program Files\...\data\Aircraft\777\Nasal\AFDS.nas :

Line 108 in the original; added one line, shown below. Easier yet, here is my modified file.

m.heading_magnetic = m.AFDS_settings.getNode("heading-magnetic",1); if (m.heading_magnetic.getValue() == nil) m.heading_magnetic.setValue(360); # KMB / Kwynn m.manual_intervention = m.AFDS_settings.initNode("manual-intervention",0,"BOOL");

0 to 360

The April, 2013 setValue() to 0 rather than 360. I have since realized that 360 is much more correct.