By accident I placed the simple midi channel filter made by Robin on the masterbus and it crashed my ardour session 9.7 . It’s also reproducable.
On a channel or bus it won’t.
I just joined the Ardour club and it’s great !
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I learned that recently as well in a test session😅
My guess is that by adding the midi only plugin, ardour wants to adjust the master channels ports to midi only, which crashes it.
I can reproduce this too: the crash is in RTAManager::RTA::run() at gtk2_ardour/rta_manager.cc:416
I think the fix is relatively simple; meanwhile, the easy work-around is of course to just not add MIDI-only plugins to the master bus 
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Hehe the solution is “just don’t do that” 
It will if you first enable the RTA on the track, and then add a MIDI plugin.
I’m looking into fixing this.
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Fixed in 9.7-54-g8536645907
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Thats fast ! Thanks.
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