Lost frontend after update to 0.84.2 - any help appreciated

I’m running HA via HASSIO on an RPi 3. I updated this morning to 0.84.2, and since updating, I can’t reach my frontend UI. I understand it’s probably a configuration issue, but I could use some help.

I have SSH access to Hassio, and when I run hassio ha logs, I get one line back:

Error decoding json unexpected end of JSON input:

The problem is, based on the info, I can’t tell where the error exists to correct it.

Anyone have some ideas or suggestions?

For the record, running hassio ha check returns the following:

core-ssh:~# hassio ha check
fatal error: runtime: out of memory

runtime stack:
runtime.throw(0x2d8b42, 0x16)
        /home/travis/.gimme/versions/go1.10.linux.amd64/src/runtime/panic.go:619 +0x60 fp=0x7ec07be0 sp=0x7ec07bd4 pc=0x3b718
runtime.sysMap(0x112b0000, 0x1250000, 0x1f601, 0x473158)
        /home/travis/.gimme/versions/go1.10.linux.amd64/src/runtime/mem_linux.go:227 +0x11c fp=0x7ec07c0c sp=0x7ec07be0 pc=0x25080
runtime.(*mheap).mapBits(0x466608, 0x12500000)
        /home/travis/.gimme/versions/go1.10.linux.amd64/src/runtime/mbitmap.go:160 +0x8c fp=0x7ec07c24 sp=0x7ec07c0c pc=0x21bb4
runtime.(*mheap).setArenaUsed(0x466608, 0x12500000, 0x2300000)
        /home/travis/.gimme/versions/go1.10.linux.amd64/src/runtime/mheap.go:545 +0x24 fp=0x7ec07c30 sp=0x7ec07c24 pc=0x32b04
runtime.(*mheap).init(0x466608, 0x2300000, 0x200000)
        /home/travis/.gimme/versions/go1.10.linux.amd64/src/runtime/mheap.go:530 +0x410 fp=0x7ec07c44 sp=0x7ec07c30 pc=0x32790
        /home/travis/.gimme/versions/go1.10.linux.amd64/src/runtime/malloc.go:392 +0x1e0 fp=0x7ec07c88 sp=0x7ec07c44 pc=0x1f854
        /home/travis/.gimme/versions/go1.10.linux.amd64/src/runtime/proc.go:485 +0x30 fp=0x7ec07cb0 sp=0x7ec07c88 pc=0x3defc
runtime.rt0_go(0x7ec07e0b, 0x7ec07e12, 0x7ec07e15, 0x0, 0x7ec07e1b, 0x7ec07e4d, 0x7ec07e61, 0x7ec07e8c, 0x7ec07e96, 0x7ec07ea1, ...)
        /home/travis/.gimme/versions/go1.10.linux.amd64/src/runtime/asm_arm.s:159 +0x7c fp=0x7ec07cf0 sp=0x7ec07cb0 pc=0x632f8

Same problem when updating to 84.2