Interpolation tools fail to execute when the input feature class has null geometry

Description

** This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1) **

The Interpolation tools, such as IDW, Kriging, and Spline, fail to execute when the input feature class has null geometry.

Cause

This is a known issue.

Workaround

Note:
This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1).