install: fix null gBitInstallDb in upgrade step

Each installer step is a separate HTTP request. install_packages.php
creates $gBitInstallDb but by the time install_upgrade.php runs it
is a fresh request and the variable is null, causing a fatal error
when upgrade_packages is submitted.

Re-establish the DB connection at the start of the upgrade submission
block if $gBitInstallDb is not already set.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/includes/install_upgrade.php b/includes/install_upgrade.php
index 2907c18..3fce5bd 100755
--- a/includes/install_upgrade.php
+++ b/includes/install_upgrade.php
@@ -13,6 +13,12 @@ $errors = $success = [];
 $gBitInstaller->loadAllUpgradeFiles();
 
 if( !empty( $_REQUEST['upgrade_packages'] )) {
+	// install_packages.php creates $gBitInstallDb but that runs in a previous request.
+	// Re-establish the connection here for the upgrade step.
+	if( empty( $gBitInstallDb ) ) {
+		$gBitInstallDb = ADONewConnection( $gBitDbType );
+		$gBitInstallDb->Connect( $gBitDbHost, $gBitDbUser, $gBitDbPassword, $gBitDbType != 'pdo' ? $gBitDbName : null );
+	}
 	if( !empty( $gDebug ) || !empty( $_REQUEST['debug'] ) ) {
 		$gBitInstallDb->debug = 99;
 	}