crontab executing my own script

Question

It's the first time after ten years of linux os (debian). I've a script in user home:

/home/user/bin/script1.sh

with correct permissions. Using shell, script runs. Inside crontab:

30 13   * * *   user        /home/user/bin/script1.sh

I see the log of cron.log like below:

Dec 27 13:30:01 server1 /USR/SBIN/CRON[22709]: (user) CMD (       /home/user/bin/script1.sh)

but script1.sh doesn't start