diff --git a/upload/source/function/function_upload.php b/upload/source/function/function_upload.php
index 5a5c584..c871875 100644
--- a/upload/source/function/function_upload.php
+++ b/upload/source/function/function_upload.php
@@ -37,11 +37,13 @@ function getuploadconfig($uid=0, $fid=0, $limit=true) {
 	loadcache('attachtype');
 	$fid = isset($_G['cache']['attachtype'][$fid]) ? $fid : 0;
 	$filter = array();
-	foreach($_G['cache']['attachtype'][$fid] as $extension => $maxsize) {
-		if($maxsize == 0) {
-			$notallow[] = $extension;
-		} else {
-			$filter[] = "'$extension':$maxsize";
+	if(is_array($_G['cache']['attachtype'][$fid])) {
+		foreach($_G['cache']['attachtype'][$fid] as $extension => $maxsize) {
+			if($maxsize == 0) {
+				$notallow[] = $extension;
+			} else {
+				$filter[] = "'$extension':$maxsize";
+			}
 		}
 	}
 	if(!empty($filter)) {