diff --git a/php/api.php b/php/api.php
index 1ca6c5e..7bd578d 100755
--- a/php/api.php
+++ b/php/api.php
@@ -40,6 +40,7 @@ if (!empty($_POST['function'])||!empty($_GET['function'])) {
 	}
 
 	# Define the table prefix
+	if (!isset($dbTablePrefix)) $dbTablePrefix = '';
 	defineTablePrefix($dbTablePrefix);
 
 	# Connect to database
diff --git a/view.php b/view.php
index 3f5f6df..50931db 100644
--- a/view.php
+++ b/view.php
@@ -31,6 +31,7 @@
 				require(LYCHEE_CONFIG_FILE);
 
 				# Define the table prefix
+				if (!isset($dbTablePrefix)) $dbTablePrefix = '';
 				defineTablePrefix($dbTablePrefix);
 
 				$database = Database::connect($dbHost, $dbUser, $dbPassword, $dbName);