public/js/anime_edit.js

@@ -39,7 +39,16 @@
 			data,
 			dataType: 'json',
 			type: 'POST',
-			success: () => {
+			success: (res) => {
+				const resData = JSON.parse(res);
+
+				if (resData.errors) {
+					_.hide(_.$('#loading-shadow')[ 0 ]);
+					_.showMessage('error', `Failed to update ${title}. `);
+					_.scrollToTop();
+					return;
+				}
+
 				if (data.data.status === 'completed') {
 					_.hide(parentSel);
 				}

public/js/base/AnimeClient.js

@@ -273,7 +273,7 @@ var AnimeClient = (function(w) {
 					responseText = request.responseText;
 				}
 
-				if (request.status > 400) {
+				if (request.status > 299) {
 					config.error.call(null, request.status, responseText, request.response);
 				} else {
 					config.success.call(null, responseText, request.status);

public/package.json

@@ -4,10 +4,10 @@
 		"watch": "watch 'npm run build' --filter=./cssfilter.js"
 	},
 	"devDependencies": {
-		"cssnano": "^3.10.0",
+		"cssnano": "^4.0.5",
 		"postcss-cachify": "^1.3.1",
 		"postcss-cssnext": "^3.0.0",
-		"postcss-import": "^10.0.0",
+		"postcss-import": "^12.0.0",
 		"watch": "^1.0.2"
 	}
 }