Raspberry Pi 4 compatibility

[RobSis]

Hey, I'm trying to use this plugin on Raspberry Pi 4. It compiles fine and even produces sounds at first, but it crashes after loading ANY preset.

$ jalv https://github.com/dcoredump/dexed.lv2
$ > preset https://github.com/dcoredump/dexed.lv2/presets#STRINGS_1
jalv: malloc.c:4043: _int_malloc: Assertion `(unsigned long) (size) >= (unsigned long) (nb)' failed.
Aborted

I noticed that there are Rpi 2 & 3 specific flags in Makefile, but even after setting -mcpu and -mfpu values to correct ones, the error doesn't change.

Could anyone help a complete C noob with this issue? Any suggestions are very appreciated!