broadcast: panics in vidgrind logs

Roughly every minute, a panic occurs in the vidgrind logs:
2023/08/16 04:03:19 http: panic serving 127.0.0.1:52073: runtime error: invalid memory address or nil pointer dereference
goroutine 95542 [running]:
net/http.(*conn).serve.func1()
    /layers/google.go.runtime/go/src/net/http/server.go:1825 +0xbf
panic({0xcbbac0, 0x14e9470})
    /layers/google.go.runtime/go/src/runtime/panic.go:844 +0x258
bitbucket.org/ausocean/iotsvc/iotds.PutVariable({0xf560e8, 0xc0006dc200}, {0x0?, 0x0?}, 0xbbd5786c57, {0xc0007e41e0, 0x2b}, {0xc000603500, 0x1a37})
    /layers/google.go.gomod/gopath/pkg/mod/bitbucket.org/ausocean/iotsvc@v0.16.0/iotds/variable.go:123 +0x1f9
main.saveBroadcast({0xf560e8, 0xc0006dc200}, 0xc0001d19c0, {0x0, 0x0})
    /layers/google.go.appengine-gomod/srv/broadcast.go:1318 +0x133
main.performChecksInternal({0xf560e8, 0xc0006dc200}, 0xc0001d19c0, 0x52c365?, {0xf59590?, 0xc00012fc80}, {0xf56740?, 0x1538388?}, 0xe686c8, 0xe686a0, ...)
    /layers/google.go.appengine-gomod/srv/broadcast.go:765 +0x5ff
main.performChecks({0xf560e8?, 0xc0006dc200?}, 0x900?, {0xf59590?, 0xc00012fc80?})
    /layers/google.go.appengine-gomod/srv/broadcast.go:776 +0x9a
main.broadcastCheckHandler({0xc0002b5a3b?, 0xffffffffffffffff?}, 0xc000554300)
    /layers/google.go.appengine-gomod/srv/broadcast.go:651 +0x33a
net/http.HandlerFunc.ServeHTTP(0x3e6b0cdfebb0?, {0xf55650?, 0xc00055c2a0?}, 0x40f245?)
    /layers/google.go.runtime/go/src/net/http/server.go:2084 +0x2f
net/http.(*ServeMux).ServeHTTP(0x0?, {0xf55650, 0xc00055c2a0}, 0xc000554300)
    /layers/google.go.runtime/go/src/net/http/server.go:2462 +0x149
net/http.serverHandler.ServeHTTP({0xc0006914a0?}, {0xf55650, 0xc00055c2a0}, 0xc000554300)
    /layers/google.go.runtime/go/src/net/http/server.go:2916 +0x43b
net/http.(*conn).serve(0xc00044bd60, {0xf56190, 0xc000616060})
    /layers/google.go.runtime/go/src/net/http/server.go:1966 +0x5d7
created by net/http.(*Server).Serve
    /layers/google.go.runtime/go/src/net/http/server.go:3071 +0x4db
It seems that the store argument is invalid when saveBroadcast calls iotds.PutVariable. I’m not sure why.
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