diff --git a/entrypoint.sh b/entrypoint.sh
index 9983944..3cec95b 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -16,6 +16,13 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+# Check mandatory Seafile configuration have been properly set.
+if [ -z $SEAF_SERVER_URL ]; then echo "The \$SEAF_SERVER_URL was not defined. Stopping container..."; echo 1; fi
+if [ -z $SEAF_USERNAME ]; then echo "The \$SEAF_USERNAME was not defined. Stopping container..."; echo 1; fi
+if [ -z $SEAF_PASSWORD ]; then echo "The \$SEAF_PASSWORD was not defined. Stopping container..."; echo 1; fi
+if [ -z $SEAF_LIBRARY_UUID ]; then echo "The \$SEAF_LIBRARY_UUID was not defined. Stopping container..."; echo 1; fi
+
+# Define variable shortcuts for readability purposes.
 seafile_ini=~/.ccnet/seafile.ini
 seafile_sock=/.seafile/seafile-data/seafile.sock
 supervisord_conf=/.supervisord/supervisord.conf