Clojurians Log v2

I have a couple of plotly plots in my clerk notebook. When I try to click the "Download as png" button it says it generates the the png but then gives an exception

Unhandled clojure.lang.ExceptionInfo
`nextjournal.clerk/show!` cannot show `nil`.
{:file-or-ns nil}

Any ideas? The stacktrace is

clerk.clj:	43	nextjournal.clerk/show!
clerk.clj:	22	nextjournal.clerk/show!
Var.java:	388	clojure.lang.Var
webserver.clj:	273	nextjournal.clerk.webserver/show!
webserver.clj:	271	nextjournal.clerk.webserver/show!
webserver.clj:	290	nextjournal.clerk.webserver/navigate!
webserver.clj:	288	nextjournal.clerk.webserver/navigate!
NO_SOURCE_FILE:	0	econ/eval47557
NO_SOURCE_FILE:	-1	econ/eval47557
Compiler.java:	7194	clojure.lang.Compiler
Compiler.java:	7149	clojure.lang.Compiler
core.clj:	3215	clojure.core/eval
core.clj:	3211	clojure.core/eval
webserver.clj:	189	nextjournal.clerk.webserver/fn--18649/fn--18652
webserver.clj:	189	nextjournal.clerk.webserver/fn--18649
webserver.clj:	183	nextjournal.clerk.webserver/fn--18649
core.clj:	2641	clojure.core/partial/fn--5908
AsyncChannel.java:	163	org.httpkit.server.AsyncChannel
RingHandler.java:	243	org.httpkit.server.WSHandler
RingHandler.java:	210	org.httpkit.server.LinkingRunnable
Executors.java:	515	java.util.concurrent.Executors/RunnableAdapter
FutureTask.java:	264	java.util.concurrent.FutureTask
ThreadPoolExecutor.java:	1128	java.util.concurrent.ThreadPoolExecutor
ThreadPoolExecutor.java:	628	java.util.concurrent.ThreadPoolExecutor/Worker
Thread.java:	829	java.lang.Thread