diff --git a/src/knownnodes.py b/src/knownnodes.py
index 1b2d5d46..5d14c8dc 100644
--- a/src/knownnodes.py
+++ b/src/knownnodes.py
@@ -79,7 +79,7 @@ def readKnownNodes():
                 except ValueError:
                     source.seek(0)
                     pickle_deserialize_old_knownnodes(source)
-    except (IOError, OSError):
+    except (IOError, OSError, KeyError):
         logger.debug(
             'Failed to read nodes from knownnodes.dat', exc_info=True)