diff --git a/lib/CProject.php b/lib/CProject.php
index 5ad7594..4d5ec9c 100644
--- a/lib/CProject.php
+++ b/lib/CProject.php
@@ -196,7 +196,7 @@ class CProject {
 			}
 			foreach($this->downloads as $idx => $filename) {
 				foreach(array_keys($known_tags) as $tagname) {
-					if (stripos($filename, $tagname) !== false) {
+					if (stripos($filename, (string)$tagname) !== false) {
 						$found_idx[$idx] = $tagname;
 						
 						$render_per_tag[$tagname][$idx] = $filename;