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Pasting audio clip into VSE causes crash (segmentation fault)
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Description

System Information
Operating system: Darwin-19.3.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 580 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.5.5

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-23 21:54, hash: rB49234c15e299

Short description of error
Pasting audio clip into VSE often causes a crash 'Segmentation fault: 11'

Exact steps for others to reproduce the error
File > New > Video Editing
Add a sound strip to the VSE.
Copy the sound strip to the clip board.
Repeatedly paste the strip into the VSE (2 to 3 times is usually enough for me to get a crash)

This is from the console when the crash happens:

add_relation(Sequencer -> Audio) - Failed, but op_from (ComponentKey(SCScene, SEQUENCER)) was ok
add_relation(Sequencer -> Audio) - Could not find op_to (ComponentKey(SCScene, AUDIO))
Writing: /var/folders/42/87vv9rt94378yy142fcsh54r0000gn/T/blender.crash.txt
Segmentation fault: 11
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

This is from blender.crash.txt

# Blender 2.90.0, Commit date: 2020-06-23 21:54, Hash 49234c15e299
bpy.ops.sequencer.sound_strip_add(filepath="/Users/myusername/Desktop/Pigeon/Recent/Cascading Down.wav", directory="/Users/myusername/Desktop/Pigeon/Recent/", files=[{"name":"Cascading Down.wav", "name":"Cascading Down.wav"}], relative_path=False, frame_start=1, channel=2)  # Operator
bpy.ops.sequencer.copy()  # Operator
bpy.ops.sequencer.paste()  # Operator
bpy.ops.sequencer.paste()  # Operator

# backtrace
0   Blender                             0x000000010afe1267 BLI_system_backtrace + 55
1   Blender                             0x0000000103c2d418 sig_handle_crash + 392
2   libsystem_platform.dylib            0x00007fff7088a42d _sigtramp + 29
3   ???                                 0x0000000000000002 0x0 + 2
4   Blender                             0x0000000103df1b18 seqclipboard_ptr_restore + 56
5   Blender                             0x0000000103df1ab2 BKE_sequencer_base_clipboard_pointers_restore + 130
6   Blender                             0x0000000104699302 sequencer_paste_exec + 178
7   Blender                             0x0000000103f6e80b wm_operator_invoke + 411
8   Blender                             0x0000000103f6fe69 wm_handler_operator_call + 633
9   Blender                             0x0000000103f6f526 wm_handlers_do_intern + 1814
10  Blender                             0x0000000103f6aa9f wm_handlers_do + 31
11  Blender                             0x0000000103f6a4bb wm_event_do_handlers + 2923
12  Blender                             0x0000000103f63640 WM_main + 32
13  Blender                             0x0000000103c29b2d main + 909
14  libdyld.dylib                       0x00007fff706917fd start + 1
15  ???                                 0x0000000000000001 0x0 + 1