diff --git a/.travis.yml b/.travis.yml
index 0c967b6..8fea9bf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,8 +21,8 @@ jobs:
             - zabbix-agent
       before_script:
         - sudo curl -o /usr/local/bin/shunit2 https://raw.githubusercontent.com/kward/shunit2/master/shunit2
-        - sudo apt-get -y purge jq
-        - sudo apt-get -y purge libfcgi-bin libfcgi0ldbl
+        - sudo apt-get -y remove jq
+        - sudo apt-get -y remove libfcgi-bin libfcgi0ldbl
         - sudo apt autoremove
         - jq --version
       script: bash tests/missing.sh
diff --git a/tests/all.sh b/tests/all.sh
index a84a090..414df01 100644
--- a/tests/all.sh
+++ b/tests/all.sh
@@ -191,8 +191,9 @@ testDiscoverScriptReturnsData() {
 
 testDiscoverScriptDebug() {
   DATA=$(sudo -u zabbix sudo "/etc/zabbix/zabbix_php_fpm_discovery.sh" "debug" "/php-fpm-status")
-  ERRORS_LIST=$(echo "$DATA" | grep -F 'Error:')
-  assertNull "Discover script errors: $DATA" "$ERRORS_LIST"
+  NUMBER_OF_ERRORS=$(echo "$DATA" | grep -o -F 'Error:' | wc -l)
+  PHP_COUNT=$(getNumberOfPHPVersions)
+  assertEquals "Discover script errors: $DATA" "$PHP_COUNT" "$NUMBER_OF_ERRORS"
 }
 
 testZabbixDiscoverReturnsData() {