AGI: "park" a call results into segmantation fault

Hello asterisk user,
I want to park a user from my AGI script. In the script I execute the following command:

After I execute the command, my script ends. Asterisk reads out the parking id 701 correctly, but then the call hangups and the whole asterisk server crashed with the following error:

[Mar 14 15:55:52] WARNING[5369]: res_agi.c:1912 run_agi: unable to send SIGHUP to AGI process 5372: No such process Segmentation fault

Do you have any suggestion in order to solve this problem?

Thank you and kind regards,