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Diffstat (limited to 'lib/python/Components/Element.py')
| -rw-r--r-- | lib/python/Components/Element.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/python/Components/Element.py b/lib/python/Components/Element.py index 54a1cc25..880274b4 100644 --- a/lib/python/Components/Element.py +++ b/lib/python/Components/Element.py @@ -29,7 +29,9 @@ class Element: # we should not disconnect from upstream if # there are still elements depending on us. assert len(self.downstream_elements) == 0, "there are still downstream elements left" - if self.source: + + # Sources don't have a source themselves. don't do anything here. + if self.source is not None: self.source.disconnectDownstream(self) def disconnectDownstream(self, downstream): |