diff --git a/packages/pyodide-kernel/py/pyodide-kernel/pyodide_kernel/display.py b/packages/pyodide-kernel/py/pyodide-kernel/pyodide_kernel/display.py
index bac096b8..790c0fbc 100644
--- a/packages/pyodide-kernel/py/pyodide-kernel/pyodide_kernel/display.py
+++ b/packages/pyodide-kernel/py/pyodide-kernel/pyodide_kernel/display.py
@@ -58,6 +58,7 @@ class LiteDisplayHook(DisplayHook):
     def __init__(self, *args, **kwargs):
         super(LiteDisplayHook, self).__init__(*args, **kwargs)
         self.publish_execution_result = None
+        self.publish_execution_error = None
 
     def start_displayhook(self):
         self.data = {}
diff --git a/packages/pyodide-kernel/py/pyodide-kernel/pyodide_kernel/interpreter.py b/packages/pyodide-kernel/py/pyodide-kernel/pyodide_kernel/interpreter.py
index aa844c36..426c371e 100644
--- a/packages/pyodide-kernel/py/pyodide-kernel/pyodide_kernel/interpreter.py
+++ b/packages/pyodide-kernel/py/pyodide-kernel/pyodide_kernel/interpreter.py
@@ -56,6 +56,12 @@ def enable_gui(self, gui=None):
         pass
 
     def _showtraceback(self, etype, evalue, stb):
+        sys.stdout.flush()
+        sys.stderr.flush()
+        dh = self.displayhook
+        if dh.publish_execution_error:
+            dh.publish_execution_error(str(etype), str(evalue), stb)
+
         self._last_traceback = {
             "ename": str(etype),
             "evalue": str(evalue),
diff --git a/packages/pyodide-kernel/src/worker.ts b/packages/pyodide-kernel/src/worker.ts
index 675d6bcb..7e75b0e3 100644
--- a/packages/pyodide-kernel/src/worker.ts
+++ b/packages/pyodide-kernel/src/worker.ts
@@ -289,7 +289,7 @@ ${e.stack}`;
       const bundle = {
         ename: ename,
         evalue: evalue,
-        traceback: traceback,
+        traceback: this.formatResult(traceback),
       };
 
       this._sendWorkerMessage({
@@ -363,6 +363,7 @@ ${e.stack}`;
     this._interpreter.display_pub.update_display_data_callback =
       updateDisplayDataCallback;
     this._interpreter.displayhook.publish_execution_result = publishExecutionResult;
+    this._interpreter.displayhook.publish_execution_error = publishExecutionError;
     this._interpreter.input = this.input.bind(this);
     this._interpreter.getpass = this.getpass.bind(this);