stm32wb55 : unhandled hardfault in enter to stop mode on LL_HSEM_1StepLock with CFG_HW_RCC_SEMID

I use custom application with FreeRTOS.

When I embed a power save mechanism, the FW periodically have an unhandled hardfault when use "maybe" stop mode API.

After more investigation like:

• pending ISR CFG_HW_ENTRY_STOP_MODE_SEMID and CFG_HW_RCC_SEMID
• hardfault by address 0x58001412 (it is a HSEM ISR CFG_HW_ENTRY_STOP_MODE_SEMID)
• and so else

i chesk an API function "PWR_EnterStopMode".

In this func I comment all code who used a CFG_HW_RCC_SEMID and FW stay work fine.

P.S when disable a stop mode like

UTIL_LPM_SetStopMode(1 << CFG_LPM_APP, UTIL_LPM_DISABLE);

all work fine without any commenting.

What could be and why?

Thanks.