Sporadic bug: "merge: heightBagRef not yet initialized"

[rubenmoor]

My reflex app froze with this output:

interactive>: merge: heightBagRef not yet initialized
CallStack (from HasCallStack):
  error, called at src/Reflex/Spider/Internal.hs:2113:39 in reflex-0.8.2.0-Gfaw3jQ1AhSLySoqu64epQ:Reflex.Spider.Internal

I don't call mergeCheap directly and can't tell what caused this. I am not able to reproduce this error, either. In case it shows up again, I will add info.

I am using reflex with obelisk.