diff --git a/trame_server/protocol.py b/trame_server/protocol.py
index fbdb2b7..3d33da9 100644
--- a/trame_server/protocol.py
+++ b/trame_server/protocol.py
@@ -189,7 +189,10 @@ def life_cycle_update(self, name):
 
     @exportRpc("trame.error.client")
     def js_error(self, message):
-        print(f" JS Error => {message}")
+        if self.server.controller.on_error.exists():
+            self.server.controller.on_error(message)
+        else:
+            print(f" JS Error => {message}")
 
     # ---------------------------------------------------------------