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Error: Fatal when using ICurve::QueryTangent for a network edge

Error Message

** Fixed at ArcGIS 8.2 **

When acquiring the polyline geometry of a geometric network edge, if the result returns an empty polyline, using the ICurve::QueryTangent method on the empty polyline geometry causes ArcMap to crash.

Cause

This is a known issue.

Solution or Workaround

Use a conditional statement that tests to make sure the geometry is not empty before using ::QueryTangent.