segfault: Jack reports error: Cannot delete key ..../event-types (BDB0073 DB_NOTFOUND: No matching key/data pair found)

[avlapp]

$ jackd --version
jackdmp version 1.9.20 tmpdir /dev/shm protocol 9

Arch Linux

$ zynaddsubfx -v

ZynAddSubFX - Copyright (c) 2002-2013 Nasca Octavian Paul and others
Copyright (c) 2009-2019 Mark McCurry [active maintainer]
This program is free software (GNU GPL v2 or later) and
it comes with ABSOLUTELY NO WARRANTY.

Version: 3.0.6

$ zynaddsubfx

ZynAddSubFX - Copyright (c) 2002-2013 Nasca Octavian Paul and others
Copyright (c) 2009-2019 Mark McCurry [active maintainer]
This program is free software (GNU GPL v2 or later) and
it comes with ABSOLUTELY NO WARRANTY.

Try 'zynaddsubfx --help' for command-line options.

Sample Rate = 48000
Sound Buffer Size = 256 samples
Internal latency = 5.3 ms
ADsynth Oscil.Size = 1024 samples
lo server running on 16879
[INFO] Nio::start()
Starting Audio: JACK
Jack buffer resized
Audio Started
Starting MIDI: JACK
MIDI Started
[INFO] exec-after-init
[INFO] startup OSC
[INFO] UI calbacks
[INFO] OSC replay
[INFO] auto_save setup
[INFO] NSM Stuff
[INFO] LASH Stuff
[INFO] Launching Zyn-Fusion...
[INFO] Loading system libzest.so
[INFO:Zyn] setup_pugl()
[INFO] Main Loop...
Jack reports error: Cannot delete key http://jackaudio.org/metadata/event-types (BDB0073 DB_NOTFOUND: No matching key/data pair found)
Deactivating and closing JACK client
Starting Audio: JACK
[INFO:Zyn] zest_tick()
Jack buffer resized
Audio Started
Starting MIDI: JACK
MIDI Started
[INFO:Zyn] zest_open()
[INFO:Zyn] Found Assets at /usr/lib/zynaddsubfx/
[INFO:Zyn] Starting Zyn-Fusion
[INFO:Zyn] Thanks for supporting the development of this project
[INFO:Zyn] Creating MRuby Interpreter...
[debug] parsing json file
[debug] json parsed succesfully
Jack reports error: Cannot delete key http://jackaudio.org/metadata/event-types (BDB0073 DB_NOTFOUND: No matching key/data pair found)
Deactivating and closing JACK client

Also reported here:
zynaddsubfx/zyn-fusion-issues#353

[edomango05]

i'm having this issue too

[enderprism]

I'm also having this issue.
OS: Manjaro
Log:

ZynAddSubFX - Copyright (c) 2002-2013 Nasca Octavian Paul and others
                Copyright (c) 2009-2019 Mark McCurry [active maintainer]
This program is free software (GNU GPL v2 or later) and 
it comes with ABSOLUTELY NO WARRANTY.

Try 'zynaddsubfx --help' for command-line options.

Sample Rate = 		48000
Sound Buffer Size = 	256 samples
Internal latency = 	5.3 ms
ADsynth Oscil.Size = 	1024 samples
lo server running on 11653
[INFO] Nio::start()
Starting Audio: JACK
Jack buffer resized
Audio Started
Starting MIDI: JACK
MIDI Started
[INFO] exec-after-init
[INFO] startup OSC
[INFO] UI calbacks
[INFO] OSC replay
[INFO] auto_save setup
[INFO] NSM Stuff
[INFO] LASH Stuff
[INFO] Launching Zyn-Fusion...
[INFO] Loading system libzest.so
[INFO:Zyn] setup_pugl()
[INFO] Main Loop...
[INFO:Zyn] zest_tick()
[INFO:Zyn] zest_open()
[INFO:Zyn] Found Assets at /usr/lib/zynaddsubfx/
[INFO:Zyn] Starting Zyn-Fusion
[INFO:Zyn] Thanks for supporting the development of this project
[INFO:Zyn] Creating MRuby Interpreter...
[debug] parsing json file
[debug] json parsed succesfully
Jack reports error: Cannot delete key http://jackaudio.org/metadata/event-types (BDB0073 DB_NOTFOUND: No matching key/data pair found)
Deactivating and closing JACK client