X-Cron-Env: wrong path

Somhow my cronjobs don't work anymore. error is coming from <PATH=/usr/bin:/bin>
How can I correct this?

Subject: Cron <root@cwp> /usr/bin/redis-cli FLUSHALL >/dev/null 2>&1
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X-Cron-Env: <LANG=de_CH.utf8>
X-Cron-Env: <LC_ALL=de_CH.utf-8>
X-Cron-Env: <XDG_SESSION_ID=6884>
X-Cron-Env: <XDG_RUNTIME_DIR=/run/user/0>
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/root>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=root>
X-Cron-Env: <USER=root>