Segmentation fault in DetectAuraControllers

Program received signal SIGSEGV, Segmentation fault.
0x0000555555571713 in DetectAuraControllers (busses=std::vector of length 12, capacity 16 = {...}, rgb_controllers=std::vector of length 0, capacity 0) at Controllers/AuraController/AuraControllerDetect.cpp:122
122                     res = busses[bus]->i2c_smbus_write_quick(aura_ram_addresses[address_list_idx], I2C_SMBUS_WRITE);
(gdb) print bus
$1 = 3
(gdb) print address_list_idx
$2 = 124320
(gdb) print res
$3 = 0