diff --git a/mesop/runtime/context.py b/mesop/runtime/context.py
old mode 100644
new mode 100755
index 3f96bd40..64281717
--- a/mesop/runtime/context.py
+++ b/mesop/runtime/context.py
@@ -1,4 +1,5 @@
 import copy
+import logging
 import threading
 import types
 import urllib.parse as urlparse
@@ -23,6 +24,8 @@
 
 Handler = Callable[[Any], Generator[None, None, None] | None]
 
+logger = logging.getLogger(__name__)
+
 
 @dataclass(kw_only=True)
 class NodeSlot:
@@ -109,9 +112,12 @@ class Context:
   def __init__(
     self,
     states: dict[type[Any], object],
+    *,
+    debug_mode: bool = False,
   ) -> None:
     self._node_tree_state = NodeTreeState()
     self._states: dict[type[Any], object] = states
+    self._debug_mode = debug_mode
     # Previous states is used for performing state diffs.
     self._previous_states: dict[type[Any], object] = copy.deepcopy(states)
     self._handlers: dict[str, Handler] = {}
@@ -383,6 +389,9 @@ def run_event_handler(
       else:
         yield
     else:
-      raise MesopException(
+      error_message = (
         f"Unknown handler id: {event.handler_id} from event {event}"
       )
+      if self._debug_mode:
+        raise MesopDeveloperException(error_message)
+      logger.warning(error_message)
diff --git a/mesop/runtime/runtime.py b/mesop/runtime/runtime.py
index 8055ceb4..0769b59a 100644
--- a/mesop/runtime/runtime.py
+++ b/mesop/runtime/runtime.py
@@ -101,7 +101,9 @@ def create_context(self) -> Context:
       for state_class in self._state_classes:
         states[state_class] = state_class()
 
-    return Context(states=cast(dict[Any, Any], states))
+    return Context(
+      states=cast(dict[Any, Any], states), debug_mode=self.debug_mode
+    )
 
   def wait_for_hot_reload(self):
     # If hot reload is in-progress, the path may not be registered yet because the client reload