Check for None first
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@ -55,7 +55,7 @@ class GraphItem(GraphicsObject):
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"""
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if 'adj' in kwds:
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self.adjacency = kwds.pop('adj')
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if self.adjacency.dtype.kind not in 'iu' and self.adjacency is not None:
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if self.adjacency is not None and self.adjacency.dtype.kind not in 'iu':
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raise Exception("adjacency array must have int or unsigned type.")
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self._update()
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if 'pos' in kwds:
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