diff --git a/Orange/canvas/application/errorreporting.py b/Orange/canvas/application/errorreporting.py
index 3fbc6167b1d..c8ae24c3472 100644
--- a/Orange/canvas/application/errorreporting.py
+++ b/Orange/canvas/application/errorreporting.py
@@ -53,8 +53,9 @@ def __init__(self, data):
         icon = QApplication.style().standardIcon(QStyle.SP_MessageBoxWarning)
         F = self.DataField
 
-        def _finished(*, key=(data[F.MODULE], data[F.WIDGET_MODULE]),
-                      filename=data[F.WIDGET_SCHEME]):
+        def _finished(*, key=(data.get(F.MODULE),
+                              data.get(F.WIDGET_MODULE)),
+                      filename=data.get(F.WIDGET_SCHEME)):
             self._cache.add(key)
             try: os.remove(filename)
             except Exception: pass