BluetoothSerial, crash on BLUEtoothSerial.begin("name");

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I have used BluetoothSerial for some time, but then deactivated it in a certain program.
Now that I want to use it again the code does not work any more but crashes.
I see now that even the libraries own example 'SerialToSerialBT' does not work any more:

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at compile time:
Using library BluetoothSerial at version 1.0 in folder: /home/dada/.arduino15/packages/esp32/hardware/esp32/1.0.5-rc2/libraries/BluetoothSerial
/home/dada/.arduino15/packages/esp32/tools/xtensa-esp32-elf-gcc/1.22.0-96-g2852398-5.2.0/bin/xtensa-esp32-elf-size -A /tmp/arduino_build_246649/SerialToSerialBT.ino.elf

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crash at run time:
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 188777542, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1100
load:0x40078000,len:10900
load:0x40080400,len:6388
entry 0x400806b4
Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.
Core 0 register dump:
PC      : 0x400def30  PS      : 0x00060730  A0      : 0x800df5d1  A1      : 0x3ffd0150  
A2      : 0x3ffdeaa0  A3      : 0x3ffd01c8  A4      : 0x00000001  A5      : 0x00000001  
A6      : 0x00060920  A7      : 0x00000000  A8      : 0x00000000  A9      : 0x3ffd0150  
A10     : 0x00000003  A11     : 0x00060923  A12     : 0x00060920  A13     : 0x3ffd01d0  
A14     : 0x000f1400  A15     : 0x3ffdeaa0  SAR     : 0x0000001a  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x0000002c  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0xffffffff  

ELF file SHA256: 0000000000000000

Backtrace: 0x400def30:0x3ffd0150 0x400df5ce:0x3ffd01a0 0x400d5969:0x3ffd01c0 0x4008f49e:0x3ffd01f0

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ESP exception decoder:
PC: 0x400def30: btc_spp_init at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/bt/bluedroid/btc/profile/std/spp/btc_spp.c line 366
EXCVADDR: 0x0000002c

Decoding stack results
0x400def30: btc_spp_init at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/bt/bluedroid/btc/profile/std/spp/btc_spp.c line 366
0x400df5ce: btc_spp_call_handler at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/bt/bluedroid/btc/profile/std/spp/btc_spp.c line 633
0x400d5969: btc_task at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/bt/common/btc/core/btc_task.c line 138
0x4008f49e: vPortTaskWrapper at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/freertos/port.c line 143

Is this a bug in esp32-arduino or is my system misconfigured?