BLE: Crash with debug prints enabled

Compiled with: ./bootstrap.sh -Ddebug_prints=true -Dble_trace=true

PalSysAssertTrap () at ../epicardium/ble/ble.c:59
59		}
(gdb) bt
#0  PalSysAssertTrap () at ../epicardium/ble/ble.c:59
#1  0x1002fd80 in WsfAssert (
    pFile=pFile@entry=0x100554f6 "../lib/sdk/Libraries/BTLE/link_layer/controller/sources/ble/bb/bb_ble_conn_slave.c", line=line@entry=143) at ../lib/sdk/Libraries/BTLE/wsf/sources/port/baremetal/wsf_assert.c:62
#2  0x100349f0 in bbSlvConnRxCompCback (status=<optimized out>, rssi=<optimized out>, crc=<optimized out>, 
    timestamp=186027024, rxPhyOptions=0 '\000')
    at ../lib/sdk/Libraries/BTLE/link_layer/controller/sources/ble/bb/bb_ble_conn_slave.c:143
#3  0x10043e6e in cb_rx_timeout_interrupt_handler (tstamp=186027024)
    at /home/maxim/Documents/src/BLE/mcbusw/Hardware/Micro/ME14/Firmware/trunk/NDALibraries/BTLE/phy/llc/shared/llc_int_handlers.c:268
#4  0x100462d2 in BTLE_SFD_TO_IRQHandler ()
    at /home/maxim/Documents/src/BLE/mcbusw/Hardware/Micro/ME14/Firmware/trunk/NDALibraries/BTLE/phy/dbb/control/pan/dbb_intc.c:366
#5  <signal handler called>
#6  0x10023808 in prvPortStartFirstTask () at ../lib/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c:267
#7  0x10023bf6 in xPortStartScheduler () at ../lib/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c:379
#8  0x00000000 in ?? ()

Code in question:

   if (bbBleCb.evtState == 0)
   {
     bbBleCb.evtState = 1;

     pConn->startTs = timestamp;

     bbBleCb.bbParam.rxTimeoutUsec = 2 * LL_MAX_TIFS_DEVIATION;
   }

   WSF_ASSERT(bbBleCb.pRxDataBuf);

   pBuf = bbBleCb.pRxDataBuf;
   bbBleCb.pRxDataBuf = NULL;