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pedrocamargo · pedrocamargo · commit b69ab25ecb6a · 2025-12-16T20:29:39.000+10:00
diff --git a/openmatrix/file.py b/openmatrix/file.py
@@ -135,7 +135,7 @@ def shape(self):
                     self.flush()
 
                 return self._shape
-        raise ShapeError("File shape is not set.")
+        return None
 
     def list_matrices(self):
         """List the matrix names in this File"""
