diff --git a/src/backend/qml_bridge.py b/src/backend/qml_bridge.py
index 848bf728..c3f94f5e 100644
--- a/src/backend/qml_bridge.py
+++ b/src/backend/qml_bridge.py
@@ -21,7 +21,7 @@ import traceback
 from concurrent.futures import Future
 from operator import attrgetter
 from threading import Thread
-from typing import Coroutine, Dict, Sequence
+from typing import Coroutine, Dict, Sequence, Set
 
 import pyotherside
 
@@ -53,6 +53,7 @@ class QMLBridge:
         self.backend: Backend = Backend()
 
         self._running_futures: Dict[str, Future] = {}
+        self._cancelled_early: Set[str]          = set()
 
         Thread(target=self._start_asyncio_loop).start()
 
@@ -78,6 +79,10 @@ class QMLBridge:
     def _call_coro(self, coro: Coroutine, uuid: str) -> None:
         """Schedule a coroutine to run in our thread and return a `Future`."""
 
+        if uuid in self._cancelled_early:
+            self._cancelled_early.remove(uuid)
+            return
+
         def on_done(future: Future) -> None:
             """Send a PyOtherSide event with the coro's result/exception."""
             result = exception = trace = None
@@ -101,7 +106,10 @@ class QMLBridge:
     ) -> None:
         """Schedule a coroutine from the `QMLBridge.backend` object."""
 
-        self._call_coro(attrgetter(name)(self.backend)(*args), uuid)
+        if uuid in self._cancelled_early:
+            self._cancelled_early.remove(uuid)
+        else:
+            self._call_coro(attrgetter(name)(self.backend)(*args), uuid)
 
 
     def call_client_coro(
@@ -109,17 +117,20 @@ class QMLBridge:
     ) -> None:
         """Schedule a coroutine from a `QMLBridge.backend.clients` client."""
 
-        client = self.backend.clients[user_id]
-        self._call_coro(attrgetter(name)(client)(*args), uuid)
+        if uuid in self._cancelled_early:
+            self._cancelled_early.remove(uuid)
+        else:
+            client = self.backend.clients[user_id]
+            self._call_coro(attrgetter(name)(client)(*args), uuid)
 
 
     def cancel_coro(self, uuid: str) -> None:
         """Cancel a couroutine scheduled by the `QMLBridge` methods."""
 
-        try:
+        if uuid in self._running_futures:
             self._running_futures[uuid].cancel()
-        except KeyError:
-            log.warning("Couldn't cancel coroutine %s, future not found", uuid)
+        else:
+            self._cancelled_early.add(uuid)
 
 
     def pdb(self, additional_data: Sequence = ()) -> None:
diff --git a/src/gui/PythonBridge/EventHandlers.qml b/src/gui/PythonBridge/EventHandlers.qml
index 96850f79..2349836b 100644
--- a/src/gui/PythonBridge/EventHandlers.qml
+++ b/src/gui/PythonBridge/EventHandlers.qml
@@ -35,6 +35,8 @@ QtObject {
     }
 
     function onCoroutineDone(uuid, result, error, traceback) {
+        if (! Globals.pendingCoroutines[uuid]) return
+
         const onSuccess = Globals.pendingCoroutines[uuid].onSuccess
         const onError   = Globals.pendingCoroutines[uuid].onError
 
diff --git a/src/gui/PythonBridge/PythonBridge.qml b/src/gui/PythonBridge/PythonBridge.qml
index 029fe8a3..99a9e3e1 100644
--- a/src/gui/PythonBridge/PythonBridge.qml
+++ b/src/gui/PythonBridge/PythonBridge.qml
@@ -43,6 +43,7 @@ Python {
     }
 
     function cancelCoro(uuid) {
+        delete Globals.pendingCoroutines[uuid]
         call("BRIDGE.cancel_coro", [uuid])
     }