--- a/build/pre_install.sh	Tue Jul 11 09:49:26 2017 +0200
+++ b/build/pre_install.sh	Fri Sep 08 12:04:06 2017 +0200
@@ -11,7 +11,7 @@
 fi
 
 
-if [ -x /usr/local/bin/drush -a -d /var/www/corpusdelaparole/drupal/sites/all/modules/corpus_module ]; then
+if [ -x /usr/local/bin/drush ] && [ -d /var/www/corpusdelaparole/drupal/sites/all/modules/corpus_module ]; then
     echo "Deactivate corpus module"
     /usr/local/bin/drush -r /var/www/corpusdelaparole/drupal pm-disable -y corpus
 fi