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Error : Unexpected Duplicate. with Warp backend. #64

sheganinans opened this Issue May 24, 2018 · 3 comments


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sheganinans commented May 24, 2018

I keep getting this error when using the jsaddle-warp backend.
However the same exact reflex widget when using jsaddle-webkit2gtk will work perfectly fine.

To replicate this error:

git clone --recurse-submodule
cd reflex-warp
nix-shell -A shells.ghc
cabal new-repl warp-reflex

Connect a web browser to http://localhost:3911, and click the button a few times and check the output in the cabal repl. Soon enough the error will show up and the webapp will freeze.

However if you instead run cabal new-repl webkit-reflex and try pushing the button, the app will work exactly as expected.

@sheganinans sheganinans reopened this May 24, 2018


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sheganinans commented Jun 2, 2018

Any luck on the replication of this bug? I tried it on a different installation of NixOS and got the same behavior.


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nomeata commented Jul 18, 2018

Does the browser freeze with high CPU usage? That’s what I am observing here at least…


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nomeata commented Jul 18, 2018

According to it is a Firefox-specific problem, and using Chrome avoids it.

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