diff --git a/classes/pref/feeds.php b/classes/pref/feeds.php
index 474f1e1db..a50592d19 100755
--- a/classes/pref/feeds.php
+++ b/classes/pref/feeds.php
@@ -999,28 +999,28 @@ class Pref_Feeds extends Handler_Protected {
 		$site_url = clean($_POST["site_url"]);
 		$upd_intl = (int) clean($_POST["update_interval"]);
 		$purge_intl = (int) clean($_POST["purge_interval"]);
-		$feed_id = (int) clean($_POST["id"]); /* editSave */
-		$feed_ids = explode(",", clean($_POST["ids"])); /* batchEditSave */
+		$feed_id = (int) clean($_POST["id"] ?? 0); /* editSave */
+		$feed_ids = explode(",", clean($_POST["ids"] ?? "")); /* batchEditSave */
 		$cat_id = (int) clean($_POST["cat_id"]);
 		$auth_login = clean($_POST["auth_login"]);
 		$auth_pass = clean($_POST["auth_pass"]);
-		$private = checkbox_to_sql_bool(clean($_POST["private"]));
+		$private = checkbox_to_sql_bool(clean($_POST["private"] ?? ""));
 		$include_in_digest = checkbox_to_sql_bool(
-			clean($_POST["include_in_digest"]));
+			clean($_POST["include_in_digest"] ?? ""));
 		$cache_images = checkbox_to_sql_bool(
-			clean($_POST["cache_images"]));
+			clean($_POST["cache_images"] ?? ""));
 		$hide_images = checkbox_to_sql_bool(
-			clean($_POST["hide_images"]));
+			clean($_POST["hide_images"] ?? ""));
 		$always_display_enclosures = checkbox_to_sql_bool(
-			clean($_POST["always_display_enclosures"]));
+			clean($_POST["always_display_enclosures"] ?? ""));
 
 		$mark_unread_on_update = checkbox_to_sql_bool(
-			clean($_POST["mark_unread_on_update"]));
+			clean($_POST["mark_unread_on_update"] ?? ""));
 
 		$feed_language = clean($_POST["feed_language"]);
 
 		if (!$batch) {
-			if (clean($_POST["need_auth"]) !== 'on') {
+			if (clean($_POST["need_auth"] ?? "") !== 'on') {
 				$auth_login = '';
 				$auth_pass = '';
 			}
diff --git a/plugins/af_readability/init.php b/plugins/af_readability/init.php
index 0fcaea107..8bd41cd77 100755
--- a/plugins/af_readability/init.php
+++ b/plugins/af_readability/init.php
@@ -159,8 +159,8 @@ class Af_Readability extends Plugin {
 		$enabled_feeds = $this->get_stored_array("enabled_feeds");
 		$append_feeds = $this->get_stored_array("append_feeds");
 
-		$enable = checkbox_to_sql_bool($_POST["af_readability_enabled"]);
-		$append = checkbox_to_sql_bool($_POST["af_readability_append"]);
+		$enable = checkbox_to_sql_bool($_POST["af_readability_enabled"] ?? "");
+		$append = checkbox_to_sql_bool($_POST["af_readability_append"] ?? "");
 
 		$enable_key = array_search($feed_id, $enabled_feeds);
 		$append_key = array_search($feed_id, $append_feeds);