Adjusting variables when building custom firmware

I might have spoken too soon; closing and then reopening the Espruino editor gives me a memory error again:

No errors in https://raw.githubusercontent.com/esprui­no/EspruinoDocs/master/devices/MPU6050_D­MP.js. Minifying 34114 bytes to 8589 bytes
No errors. Minifying 14282 bytes to 12744 bytes
>
 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v06 (c) 2019 G.Williams
>Resetting MPU6050...
New interpreter error: LOW_MEMORY,MEMORY
OTP bank is valid!
Uncaught Error: Function or String not supplied!
 at line 1 col 353
...r();setTimeout(e,20,a,c,g,h)
                              ^
in function called from system