closing surge vst3 gui crashes qtractor

[ghost]

steps to reproduce:

1. be sure surge 1.9 and qtractor 0.9.23.18 are installed
2. open qtractor
3. create a new midi track and add surge
4. surge gui will open, close it
5. qtractor crashes

i'm using a fresh install of ubuntu studio 20.04

[rncbc]

Surge XT, freshly built from main branch, doesn't crash as you say.

Version:  Surge XT 0.9.main.ef516c04
Build:  2021-10-14 @ 11:33:50 on 'gamma/local' with 'GNU-11.2.1' using JUCE 60101
System:  Linux 64-bit VST3 on  Intel(R) Core(TM) i5-7400 CPU @ 3.00GHz

Qt: 6.2.0
Qtractor: 0.9.23.18git.8fd00d [develop]