diff --git a/cron/start_cron.sh b/cron/start_cron.sh
index 763ed4c..4d90d67 100755
--- a/cron/start_cron.sh
+++ b/cron/start_cron.sh
@@ -1,5 +1,3 @@
-#!/bin/sh
-
 # serialize ENV for cron-jobs
 TMP_FILE=/tmp/cron_env
 OUT_FILE=/cron_env
@@ -10,6 +8,10 @@ while read -r line; do
   if [ $? = 0 ]; then
     continue
   fi
+  if ! [[ ${line} =~ ^[a-zA-Z0-9_]+=.+$ ]]; then
+    echo "$0: Messed up ENV: ${line}"
+    continue
+  fi
   echo "${line}" | grep -q "\s"
   if [ $? = 0 ]; then
     # double-quote blank separated values for $(export)
@@ -23,5 +25,4 @@ while read -r line; do
 done <"${TMP_FILE}"
 unlink "${TMP_FILE}"
 # start crond in background
-/usr/sbin/crond -b -S
-
+/usr/sbin/crond -b -S
\ No newline at end of file