custom build for lolin D32 pro

Hi,
I got the lolin D32 pro board that's advertised to have 16mb flash + 8 mb PSRAM.

I'd like to run the espirit "firmware" (which is clojurescript compiler on top of espruino ) using that manual https://cljdoc.org/d/esprit/esprit/1.0.0/doc/building-espruino

The build goes smooth, however after reset the board outpits this:

ets Jul 29 2019 12:21:46

rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:2668
load:0x40078000,len:7304
load:0x40080000,len:5312
entry 0x40080274
ASSERT(length>0) FAILED AT src/jsvar.c:4189
  #1[r1,l2] Object {
    #2[r1,l2] Name String [1 blocks] "\xFF"      #3[r1,l1] Object {
        #6[r1,l2] Name String [2 blocks] "timers"          #8[r2,l0] Array(0) [ ]
        #9[r1,l2] Name String [2 blocks] "watches"          #11[r2,l0] Array(0) [ ]
        #14[r1,l2] Name String [1 blocks] "net"          #12[r1,l1] String [2 blocks] "\5\0\0\0\0\xFF\xFF\xFF\0\0\0\0"
      }
  }
HALTING.

any hints / help is appreciated