It seems I can't attach the crash file so I will copy it here. Sorry for the long message !
Segmentation violation detected at 2021-02-19 09:38:12 -0500
--------------------------------------------------------------------------------
Configuration:
Crash Decoding : Disabled - No sandbox or build area path
Crash Mode : continue (default)
Default Encoding : UTF-8
Deployed : false
Graphics Driver : Intel Inc. Intel(R) Iris(TM) Plus Graphics OpenGL Engine Version 2.1 INTEL-16.1.11
Java Version : Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
MATLAB Architecture : maci64
MATLAB Entitlement ID : 6257193
MATLAB Root : /Applications/Matlab_R2020b.app
MATLAB Version : 9.9.0.1467703 (R2020b)
OpenGL : hardware
Operating System : Mac OS Version 10.16 (Build 20D74)
Process ID : 680
Processor ID : x86 Family 6 Model 126 Stepping 5, GenuineIntel
Session Key : 0b0d9355-f6cf-44a9-8f8e-2de014fff91d
Window System : Quartz
Fault Count: 4
Abnormal termination:
Segmentation violation
Current Thread: 'MCR 0 interpreter thread' id 0x70000c8fc000
Register State (from fault):
RAX = 000000002321fb70 RBX = 000000002321fb50
RCX = 00007fdbdc400000 RDX = 00000000001bd9f3
RSP = 000070000c8f28f0 RBP = 000000000c8f2da8
RSI = 0000000000000001 RDI = 00007fdc40bc2068
R8 = 000000000c8f2da8 R9 = 0000000000000001
R10 = 00007fdc40bc2070 R11 = 00007fdbdc400000
R12 = 000000002321fb70 R13 = 00007fdc9810d4f0
R14 = 00007fdc40bc2068 R15 = 0000000000000002
RIP = 00000002231f1ec0 RFL = 0000000000010283
CS = 000000000000002b FS = 0000000000000000 GS = 0000000000000000
Stack Trace (from fault):
[ 0] 0x00000001129ba079 /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00004217 _ZN10foundation4core4diag15stacktrace_base7captureERKNS1_14thread_contextEm+00000057
[ 1] 0x00000001129bf98a /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00027018 _ZN10foundation4core4test17terminate_handledERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE+00011546
[ 2] 0x00000001129bc9b5 /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00014773 _ZN10foundation4core4diag13terminate_logEPKcPK17__darwin_ucontext+00000149
[ 3] 0x0000000118219d7b /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00560507 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00012427
[ 4] 0x000000011821780d /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00550925 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00002845
[ 5] 0x0000000118215240 /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00541248 mnFatalSignalHandler+00000144
[ 6] 0x00007fff204cad7d /usr/lib/system/libsystem_platform.dylib+00015741 _sigtramp+00000029
Abnormal termination:
Segmentation violation
Current Thread: '' id 0x70001016e000
Register State (from fault):
RAX = 000000002321fb70 RBX = 000000002321fb50
RCX = 00007fdc0c400000 RDX = 00000000001bd9f7
RSP = 000070001016d230 RBP = 000000001016d6e8
RSI = 0000000000000001 RDI = 00007fdc40bc2048
R8 = 000000001016d6e8 R9 = 0000000000000001
R10 = 00007fdc40bc2050 R11 = 00007fdc0c400000
R12 = 000000002321fb70 R13 = 00007fdc9810d538
R14 = 00007fdc40bc2048 R15 = 0000000000000002
RIP = 00000002231f1ec0 RFL = 0000000000010287
CS = 000000000000002b FS = 0000000000000000 GS = 0000000000000000
Stack Trace (from fault):
[ 0] 0x00000001129ba079 /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00004217 _ZN10foundation4core4diag15stacktrace_base7captureERKNS1_14thread_contextEm+00000057
[ 1] 0x00000001129bf98a /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00027018 _ZN10foundation4core4test17terminate_handledERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE+00011546
[ 2] 0x00000001129bc9b5 /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00014773 _ZN10foundation4core4diag13terminate_logEPKcPK17__darwin_ucontext+00000149
[ 3] 0x0000000118219d7b /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00560507 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00012427
[ 4] 0x000000011821780d /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00550925 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00002845
[ 5] 0x0000000118215240 /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00541248 mnFatalSignalHandler+00000144
[ 6] 0x00007fff204cad7d /usr/lib/system/libsystem_platform.dylib+00015741 _sigtramp+00000029
Abnormal termination:
Segmentation violation
Current Thread: '' id 0x700010274000
Register State (from fault):
RAX = 000000002321fb70 RBX = 000000002321fb50
RCX = 00007fdbac400000 RDX = 00000000001bd9fb
RSP = 0000700010273230 RBP = 00000000102736e8
RSI = 0000000000000001 RDI = 00007fdc40bc2028
R8 = 00000000102736e8 R9 = 0000000000000001
R10 = 00007fdc40bc2030 R11 = 00007fdbac400000
R12 = 000000002321fb70 R13 = 00007fdc9810d580
R14 = 00007fdc40bc2028 R15 = 0000000000000002
RIP = 00000002231f1ec0 RFL = 0000000000010287
CS = 000000000000002b FS = 0000000000000000 GS = 0000000000000000
Stack Trace (from fault):
[ 0] 0x00000001129ba079 /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00004217 _ZN10foundation4core4diag15stacktrace_base7captureERKNS1_14thread_contextEm+00000057
[ 1] 0x00000001129bf98a /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00027018 _ZN10foundation4core4test17terminate_handledERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE+00011546
[ 2] 0x00000001129bc9b5 /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00014773 _ZN10foundation4core4diag13terminate_logEPKcPK17__darwin_ucontext+00000149
[ 3] 0x0000000118219d7b /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00560507 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00012427
[ 4] 0x000000011821780d /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00550925 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00002845
[ 5] 0x0000000118215240 /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00541248 mnFatalSignalHandler+00000144
[ 6] 0x00007fff204cad7d /usr/lib/system/libsystem_platform.dylib+00015741 _sigtramp+00000029
Abnormal termination:
Segmentation violation
Current Thread: '' id 0x700011733000
Register State (from fault):
RAX = 000000002321fb70 RBX = 000000002321fb50
RCX = 00007fdb7c400000 RDX = 00000000001bd9ff
RSP = 0000700011732230 RBP = 00000000117326e8
RSI = 0000000000000001 RDI = 00007fdc40bc2008
R8 = 00000000117326e8 R9 = 0000000000000001
R10 = 00007fdc40bc2010 R11 = 00007fdb7c400000
R12 = 000000002321fb70 R13 = 00007fdc9810d5c8
R14 = 00007fdc40bc2008 R15 = 0000000000000002
RIP = 00000002231f1ec0 RFL = 0000000000010283
CS = 000000000000002b FS = 0000000000000000 GS = 0000000000000000
Stack Trace (from fault):
[ 0] 0x00000001129ba079 /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00004217 _ZN10foundation4core4diag15stacktrace_base7captureERKNS1_14thread_contextEm+00000057
[ 1] 0x00000001129bf98a /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00027018 _ZN10foundation4core4test17terminate_handledERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE+00011546
[ 2] 0x00000001129bc9b5 /Applications/Matlab_R2020b.app/bin/maci64/libmwfl.dylib+00014773 _ZN10foundation4core4diag13terminate_logEPKcPK17__darwin_ucontext+00000149
[ 3] 0x0000000118219d7b /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00560507 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00012427
[ 4] 0x000000011821780d /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00550925 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00002845
[ 5] 0x0000000118215240 /Applications/Matlab_R2020b.app/bin/maci64/libmwmcr.dylib+00541248 mnFatalSignalHandler+00000144
[ 6] 0x00007fff204cad7d /usr/lib/system/libsystem_platform.dylib+00015741 _sigtramp+00000029