SysEx Message fails always

[airbenich]

I'm trying to send an SysEx Message like this: f0 43 10 3E 11 01 00 42 00 26 00 2F 00 00 00 00 00 F7

Unfortunately i get the following output:

Sending SysEx MIDI Message to Port: USB MIDI Interface
Not a valid SysEx message.
[ 'F0', '43 10 3E 11 01 00 42 00 26 00 2F 00 00 00 00 00 F7' ]

It looks like there is a bug in the if statement (& else) in line 980. When my input value messageArray[0] equals F0, then Line 980 will be true and Line 982 will lead to NaN. Therefore line 987 will be true and the execution stops. Or do i miss a thing here?

https://github.com/josephdadams/midi-relay/blob/4cfd6610f40f0853fb78e048359e16c0be6e5103/main.js#L979-L992