Part of the bug report, can submit a full report if needed:
Process: LeagueClientUx [30696]
Path: /Applications/League of Legends.app/Contents/LoL/League of Legends.app/Contents/MacOS/LeagueClientUx
Identifier: com.riotgames.LeagueofLegends.LeagueClientUx
Version: 1.0
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: LeagueClientUx [30696]
User ID: 501
Date/Time: 2019-10-16 11:27:44.967 -0600
OS Version: Mac OS X 10.14.5 (18F132)
Report Version: 12
Anonymous UUID: 55609C39-6747-B700-6F72-93357BEC0AA5
Sleep/Wake UUID: 4CC5935F-B70A-44C0-A6A6-436FCF7679F2
Time Awake Since Boot: 900000 seconds
Time Since Wake: 4300 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [30696]
VM Regions Near 0:
-->
__TEXT 000000010d264000-000000010d5f7000 [ 3660K] r-x/rwx SM=COW /Applications/League of Legends.app/Contents/LoL/League of Legends.app/Contents/MacOS/LeagueClientUx
Application Specific Information:
dyld2 mode
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 com.riotgames.LeagueofLegends.LeagueClientUx 0x000000010d29688b 0x10d264000 + 206987
1 com.riotgames.LeagueofLegends.LeagueClientUx 0x000000010d295a74 0x10d264000 + 203380
2 libdyld.dylib 0x00007fff683a13d5 start + 1
Thread 1:
0 libsystem_pthread.dylib 0x00007fff685943f0 start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x00007fff685943f0 start_wqthread + 0
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x00007ffee299b880 rcx: 0x00000001138b566c rdx: 0x00000000888fb81a
rdi: 0x00000000886fb01b rsi: 0x0000600001af4320 rbp: 0x00007ffee299b7b0 rsp: 0x00007ffee299b760
r8: 0x00000000000001ff r9: 0x00000000000007fb r10: 0x00007ffee299bc38 r11: 0x00007fff684d6b65
r12: 0x0000000000000000 r13: 0x0000000000000000 r14: 0x00007ffee299b7f8 r15: 0x0000000000000000
rip: 0x000000010d29688b rfl: 0x0000000000010206 cr2: 0x0000000000000000
Logical CPU: 0
Error Code: 0x00000006
Trap Number: 14