Fixed check in PHP < 5.5

diff --git a/wcfsetup/install/files/lib/system/package/PackageInstallationScheduler.class.php b/wcfsetup/install/files/lib/system/package/PackageInstallationScheduler.class.php
index a84266dcbd78cc14450fbceb4935ed86f6e25d2d..19416dabcc17f251514209c7633dbd59506b52c6 100644 (file)
--- a/wcfsetup/install/files/lib/system/package/PackageInstallationScheduler.class.php
+++ b/wcfsetup/install/files/lib/system/package/PackageInstallationScheduler.class.php
@@ -265,7 +265,8 @@ class PackageInstallationScheduler {
                        
                        // check install instructions
                        if ($validateInstallInstructions) {
-                               if (empty($archive->getInstallInstructions())) {
+                               $installInstructions = $archive->getInstallInstructions();
+                               if (empty($installInstructions)) {
                                        throw new SystemException("Package '" . $archive->getLocalizedPackageInfo('packageName')  . "' (" . $archive->getPackageInfo('name') . ") does not contain valid installation instructions.");
                                }
                        }