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diff --git a/pywbem/_cim_obj.py b/pywbem/_cim_obj.py
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index d91a2cb1..5c9a69a5 100644
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--- a/pywbem/_cim_obj.py
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+++ b/pywbem/_cim_obj.py
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@@ -1954,6 +1954,7 @@ class CIMInstanceName(_CIMComparisonMixin):
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                 _format("WBEM URI has an invalid format for its keybindings: "
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                         "{0!A}", keybindings_str))
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+        kb_assigns = []
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         if m.group(1):
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             kb_assigns = [m.group(1)]
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