ccache: do not override owner_uid fetching for virtual feeds

functions.php

@@ -5801,9 +5801,11 @@
 
 		if (!$is_cat) {
 			$table = "ttrss_counters_cache";
-			$tmp_result = db_query($link, "SELECT owner_uid FROM ttrss_feeds 
-				WHERE id = '$feed_id'");
-			$owner_uid = db_fetch_result($tmp_result, 0, "owner_uid");
+			if ($feed_id > 0) {
+				$tmp_result = db_query($link, "SELECT owner_uid FROM ttrss_feeds 
+					WHERE id = '$feed_id'");
+				$owner_uid = db_fetch_result($tmp_result, 0, "owner_uid");
+			}
 		} else {
 			$table = "ttrss_cat_counters_cache";
 		}
@@ -5835,7 +5837,7 @@
 
 		if (!is_numeric($feed_id)) return;
 
-		if (!$is_cat) {
+		if (!$is_cat && $feed_id > 0) {
 			$tmp_result = db_query($link, "SELECT owner_uid FROM ttrss_feeds 
 				WHERE id = '$feed_id'");
 			$owner_uid = db_fetch_result($tmp_result, 0, "owner_uid");