diff --git a/ChangeLog b/ChangeLog
index ce955d70a..b39e9949b 100755
--- a/ChangeLog
+++ b/ChangeLog
@@ -11,6 +11,7 @@ $Source$
       TODO: - Update docs
             - Add conversion code to the docs
             - add charset checks to pmadb validation code
+    * main.php: bug #991887.
 
 2004-07-15 Michal Čihař  <michal@cihar.com>
     * tbl_properties_export.php: Fix export of queries with empty WHERE clause
diff --git a/main.php b/main.php
index bc730bef0..ff0dad4b4 100644
--- a/main.php
+++ b/main.php
@@ -583,7 +583,7 @@ echo "\n";
 // added by Michael Keck <mail_at_michaelkeck_dot_de>
 // ThemeManager if available
 
-if (count($available_themes_choices)>1) {
+if (isset($available_themes_choices) && $available_themes_choices > 1) {
     $theme_selected = FALSE;
     $theme_preview_path= './themes.php';
     $theme_preview_href = '<a href="' . $theme_preview_path . '" target="themes" onclick="'