diff --git a/README.md b/README.md
index ed678c8..eb82bb6 100644
--- a/README.md
+++ b/README.md
@@ -76,10 +76,10 @@ Oder manuell:
 
 ```bash
 # .txz von Gitea laden
-curl -O http://192.168.1.2:4000/michael/MUA-Mikes-Unraid-Agent/raw/branch/main/dist/mua-2026.08.21.r011-x86_64-1.txz
+curl -O http://192.168.1.2:4000/michael/MUA-Mikes-Unraid-Agent/raw/branch/main/dist/mua-2026.08.21.r012-x86_64-1.txz
 
 # Installieren
-upgradepkg --install-new mua-2026.08.21.r011-x86_64-1.txz
+upgradepkg --install-new mua-2026.08.21.r012-x86_64-1.txz
 ```
 
 ### 2. Service starten
@@ -94,7 +94,7 @@ Der Service startet automatisch bei jedem Boot (SysVinit).
 
 ```bash
 curl http://192.168.1.2:3002/health
-# → {"status":"ok","version":"2026.08.21.r011","auth":"required"}
+# → {"status":"ok","version":"2026.08.21.r012","auth":"required"}
 ```
 
 ---
diff --git a/dist/mua-2026.08.21.r012-x86_64-1.txz b/dist/mua-2026.08.21.r012-x86_64-1.txz
new file mode 100644
index 0000000..bd7aee2
Binary files /dev/null and b/dist/mua-2026.08.21.r012-x86_64-1.txz differ
diff --git a/package.json b/package.json
index ac04e08..6db3ed1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mua",
-  "version": "2026.08.21.r011",
+  "version": "2026.08.21.r012",
   "description": "Mikes Unraid Agent - MCP over HTTP (Streamable HTTP) for Unraid",
   "type": "module",
   "main": "src/index.ts",
diff --git a/plugin/mua.plg b/plugin/mua.plg
index a8c4631..a500dc7 100644
--- a/plugin/mua.plg
+++ b/plugin/mua.plg
@@ -2,13 +2,13 @@
 <!DOCTYPE PLUGIN [
 <!ENTITY name        "mua">
 <!ENTITY author      "Michael">
-<!ENTITY version     "2026.08.21.r011">
+<!ENTITY version     "2026.08.21.r012">
 <!ENTITY launch      "Settings/mua">
 <!ENTITY pluginURL   "http://192.168.1.2:4000/michael/MUA-Mikes-Unraid-Agent/raw/branch/main/plugin/mua.plg">
 <!ENTITY pluginLOC   "/boot/config/plugins/&name;">
 <!ENTITY emhttpLOC   "/usr/local/emhttp/plugins/&name;">
-<!ENTITY txzURL      "http://192.168.1.2:4000/michael/MUA-Mikes-Unraid-Agent/raw/branch/main/dist/mua-2026.08.21.r011-x86_64-1.txz">
-<!ENTITY txzSHA256   "fcbcce197a4eb14e4f039645027a94d9d037f1e469c8da2e079fca7bf96f36d3">
+<!ENTITY txzURL      "http://192.168.1.2:4000/michael/MUA-Mikes-Unraid-Agent/raw/branch/main/dist/mua-2026.08.21.r012-x86_64-1.txz">
+<!ENTITY txzSHA256   "efe623e3b717c104ff48eee6861f0fe0900a16c2e82cdc4c640943295a149717">
 ]>
 
 <PLUGIN  name="&name;"
@@ -23,6 +23,8 @@
 >
 
 <CHANGES>
+### 2026.08.21.r012
+- CA-Installationsfix: Vorhandene Container werden über eine exakte Docker-Namensabfrage erkannt statt durch fehleranfällige Interpretation von Docker-Fehlertexten.
 ### 2026.08.21.r011
 - CA-Vorschau-Fix: asynchrone Bun-Dateiprüfungen werden korrekt abgewartet; freie Container- und Templatenamen werden nicht mehr fälschlich als belegt gemeldet.
 ### 2026.08.21.r010
@@ -105,7 +107,7 @@ Das .txz enthält:
   install/doinst.sh              (läuft nach Installation)
 ===========================================
 -->
-<FILE Name="/boot/config/plugins/&name;/mua-2026.08.21.r011-x86_64-1.txz" Run="upgradepkg --install-new" Mode="755" Min="7.0.0">
+<FILE Name="/boot/config/plugins/&name;/mua-2026.08.21.r012-x86_64-1.txz" Run="upgradepkg --install-new" Mode="755" Min="7.0.0">
 <URL>&txzURL;</URL>
 <SHA256>&txzSHA256;</SHA256>
 </FILE>
diff --git a/plugin/plugin.json b/plugin/plugin.json
index b5775c1..e22b286 100644
--- a/plugin/plugin.json
+++ b/plugin/plugin.json
@@ -1,7 +1,7 @@
 {
     "name": "mua",
     "author": "Michael",
-    "version": "2026.08.21.r011",
+    "version": "2026.08.21.r012",
     "minver": "7.0.0",
     "pluginDirectory": "/usr/local/emhttp/plugins/mua",
     "configDirectory": "/boot/config/plugins/mua",
diff --git a/scripts/unraid-docker-mcp-helper.php b/scripts/unraid-docker-mcp-helper.php
index 8777234..3e7522a 100644
--- a/scripts/unraid-docker-mcp-helper.php
+++ b/scripts/unraid-docker-mcp-helper.php
@@ -262,8 +262,10 @@ function ca_install(string $template_url, string $name, string $overrides_json,
 
     $template_path = "/boot/config/plugins/dockerMan/templates-user/my-$name.xml";
     if (file_exists($template_path)) fail("Template already exists: $name");
-    $existing = trim(docker_exec('inspect --type container --format {{.Name}} ' . escapeshellarg($name)));
-    if ($existing !== '' && stripos($existing, 'Error:') !== 0) fail("Container already exists: $name");
+    $existing = trim(docker_exec(
+        'ps -a --filter ' . escapeshellarg("name=^/$name$") . ' --format ' . escapeshellarg('{{.Names}}')
+    ));
+    if (in_array($name, preg_split('/\R/', $existing) ?: [], true)) fail("Container already exists: $name");
 
     $context = stream_context_create(['http' => [
         'timeout' => 30,
diff --git a/src/helpers.ts b/src/helpers.ts
index c978d7f..7b4a73a 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -14,7 +14,7 @@ import { createHash, randomUUID } from "node:crypto";
 
 // ── Konstanten ──────────────────────────────────────────────────────────
 export const MUA_SERVER_NAME = "mua";
-export const MUA_VERSION = "2026.08.21.r011";
+export const MUA_VERSION = "2026.08.21.r012";
 export const MUA_PROTOCOL_VERSION = "2025-03-26";
 export const PHP_HELPER = "/usr/local/bin/unraid-docker-mcp-helper.php";
 export const STATUS_HELPER = "/usr/local/bin/unraid-mcp-status-helper.php";