diff --git a/.editorconfig b/.editorconfig
index 8565b274..ef6e90b2 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -27,3 +27,6 @@ indent_size = 2
 [*.json]
 indent_style = space
 indent_size = 2
+
+[composer.json]
+indent_size = 4
diff --git a/advancedcontentfilter/advancedcontentfilter.js b/advancedcontentfilter/advancedcontentfilter.js
index fcf7b096..a8fc1c65 100644
--- a/advancedcontentfilter/advancedcontentfilter.js
+++ b/advancedcontentfilter/advancedcontentfilter.js
@@ -54,7 +54,7 @@ new Vue({
 					self.rules.push(responseJSON.rule);
 					self.resetForm();
 				}, function (response) {
-					self.errorMessage = response.responseJSON.message;
+					self.errorMessage = response.responseJSON.exception[0].message;
 				});
 			}
 		},
@@ -74,7 +74,7 @@ new Vue({
 				self.rules[self.editedIndex] = rule;
 				self.resetForm();
 			}, function (response) {
-				self.errorMessage = response.responseJSON.message;
+				self.errorMessage = response.responseJSON.exception[0].message;
 			});
 		},
 
diff --git a/advancedcontentfilter/composer.json b/advancedcontentfilter/composer.json
index ceb152e7..b9ab1900 100644
--- a/advancedcontentfilter/composer.json
+++ b/advancedcontentfilter/composer.json
@@ -1,24 +1,27 @@
 {
-	"name": "friendica-addons/advancedcontentfilter",
-	"description": "Advanced Content Filter addon for Friendica",
-	"type": "friendica-addon",
-	"authors": [
-		{
-			"name": "Hypolite Petovan",
-			"email": "hypolite@mrpetovan.com",
-			"homepage": "https://friendica.mrpetovan.com/profile/hypolite",
-			"role": "Developer"
-		}
-	],
-	"require": {
-		"slim/slim": "^4",
-		"symfony/expression-language": "^3.4"
-	},
-	"license": "3-clause BSD license",
-	"minimum-stability": "stable",
-	"config": {
-		"optimize-autoloader": true,
-		"autoloader-suffix": "AdvancedContentFilterAddon",
-		"preferred-install": "dist"
-	}
+    "name": "friendica-addons/advancedcontentfilter",
+    "description": "Advanced Content Filter addon for Friendica",
+    "type": "friendica-addon",
+    "authors": [
+        {
+            "name": "Hypolite Petovan",
+            "email": "hypolite@mrpetovan.com",
+            "homepage": "https://friendica.mrpetovan.com/profile/hypolite",
+            "role": "Developer"
+        }
+    ],
+    "require": {
+        "slim/slim": "^4",
+        "symfony/expression-language": "^3.4"
+    },
+    "license": "3-clause BSD license",
+    "minimum-stability": "stable",
+    "config": {
+        "platform": {
+            "php": "7.4"
+        },
+        "optimize-autoloader": true,
+        "autoloader-suffix": "AdvancedContentFilterAddon",
+        "preferred-install": "dist"
+    }
 }
diff --git a/advancedcontentfilter/src/middlewares.php b/advancedcontentfilter/src/middlewares.php
index 84dd6ed8..2b831473 100644
--- a/advancedcontentfilter/src/middlewares.php
+++ b/advancedcontentfilter/src/middlewares.php
@@ -29,4 +29,4 @@ use Friendica\DI;
  */
 $slim->addRoutingMiddleware();
 
-$errorMiddleware = $slim->addErrorMiddleware(true, true, true);
+$errorMiddleware = $slim->addErrorMiddleware(true, true, true, DI::logger());