diff --git a/package.json b/package.json
index cca53e7..92319e9 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "zeed",
   "type": "module",
-  "version": "0.25.0",
+  "version": "0.25.1",
   "description": "🌱 Simple foundation library",
   "author": {
     "name": "Dirk Holtwick",
diff --git a/src/common/data/convert.ts b/src/common/data/convert.ts
index f487371..7f4a062 100644
--- a/src/common/data/convert.ts
+++ b/src/common/data/convert.ts
@@ -1,4 +1,5 @@
 import { Uint8ArrayToHexDump } from './bin'
+import { objectPlain } from './object'
 
 // import { jsonStringify } from './json'
 
@@ -111,6 +112,7 @@ export function formatMessages(
         return `${obj.name || 'Error'}: ${obj.message}\n${obj.stack}`
       }
       try {
+        obj = objectPlain(obj)
         return pretty ? JSON.stringify(obj, null, 2) : JSON.stringify(obj)
       }
       catch (err) {}
diff --git a/src/common/log/log-memory.ts b/src/common/log/log-memory.ts
index a1ae970..fd32738 100644
--- a/src/common/log/log-memory.ts
+++ b/src/common/log/log-memory.ts
@@ -32,7 +32,11 @@ export function LoggerMemoryHandler(
 
     msg.timestamp ??= getTimestamp()
 
-    const m = objectPlain(msg, { maxDepth, errorTrace })
+    const m = objectPlain(msg, {
+      maxDepth,
+      errorTrace,
+      keepAsIs: v => v instanceof Error,
+    })
 
     if (compact === true)
       (messages as LogMessageCompact[]).push([m.timestamp, m.level, m.name, ...m.messages])