diff --git a/.travis.yml b/.travis.yml
index 9a402e4a..125406fb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,6 @@ php:
   - 5.5.9
   - 5.5
   - 5.6
-  - hhvm
 
 env:
   global:
@@ -18,7 +17,13 @@ env:
 before_install: true
 
 install:
-  - sudo apt-get install parallel
+  - wget http://ftp.gnu.org/gnu/parallel/parallel-20120522.tar.bz2
+  - tar -xvjf parallel*
+  - cd parallel*
+  - ./configure
+  - make
+  - sudo make install
+  - cd ..
   - eval `ssh-agent -s`
   - travis/setup-secure-shell.sh
   - sh -c "if [ '$TRAVIS_PHP_VERSION' != 'hhvm' ]; then travis/install-php-extensions.sh; fi"
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 1e815e0e..7cde0875 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -3880,7 +3880,11 @@ class Net_SSH2
      */
     function getLastError()
     {
-        return $this->errors[count($this->errors) - 1];
+        $count = count($this->errors);
+
+        if ($count > 0) {
+            return $this->errors[$count - 1];
+        }
     }
 
     /**
diff --git a/tests/Unit/File/ASN1Test.php b/tests/Unit/File/ASN1Test.php
index 2a6c4d63..fe0e01b4 100644
--- a/tests/Unit/File/ASN1Test.php
+++ b/tests/Unit/File/ASN1Test.php
@@ -18,7 +18,7 @@ class Unit_File_ASN1Test extends PhpseclibTestCase
         $KDC_REP = array(
             'type' => FILE_ASN1_TYPE_SEQUENCE,
             'children' => array(
-                 'pvno' => array(
+                'pvno' => array(
                     'constant' => 0,
                     'optional' => true,
                     'explicit' => true,