diff --git a/lib/veilid_processor/views/developer.dart b/lib/veilid_processor/views/developer.dart
index 08463fb..0bfcc0a 100644
--- a/lib/veilid_processor/views/developer.dart
+++ b/lib/veilid_processor/views/developer.dart
@@ -65,8 +65,9 @@ class _DeveloperPageState extends State<DeveloperPage> {
   }
 
   void _debugOut(String out) {
+    final sanitizedOut = out.replaceAll('\uFFFD', '');
     final pen = AnsiPen()..cyan(bold: true);
-    final colorOut = pen(out);
+    final colorOut = pen(sanitizedOut);
     debugPrint(colorOut);
     globalDebugTerminal.write(colorOut.replaceAll('\n', '\r\n'));
   }