I had a user report this issue to me. It is pretty easy to replicate.

Press J to open the fullscreen map.
Press O to open the options screen.
Expand either of the minimap preset options.
Scroll down to click the Position Button.
Expands "Minimap Position Options" to open that up.
Check "Hide Effect Icons" (effects disappear)
Uncheck "Hide Effects Icons" -> crash

TeamJM/journeymap#941

I removed all my hud rendering code in the events for testing and can replicate it by

    @SubscribeEvent(priority = EventPriority.LOWEST)
    public void preOverlayLow(RenderGuiLayerEvent.Pre event)
    {
        if (EFFECTS.equals(event.getName()) && JourneymapClient.getInstance().getActiveMiniMapProperties().hideEffectIcons.get())
        {
            event.setCanceled(true);
        }
    }

I am still investigating if this is a me issue or a you issue. The crash log does not give very much.
I can replicate this crash from anywhere I enable and then disable hiding of the effects, not just the position screen.

Logs can be found in the original issue.