Why does the IIRGRPDELAY function, with a group delay of zero crash MATLAB 6.1 (R12.1)?

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MathWorks Support Team
Why does the IIRGRPDELAY function, with a group delay of zero crash MATLAB 6.1 (R12.1)?
The following code crashes MATLAB:
iirgrpdelay(8,[0 1],[0 1],[0 0])
The frequency values are arbitrary; what's relevant is the group delay of 0. Obviously zero group delay is illegal, but it crashes Matlab. An error message would be so much more friendly.

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MathWorks Support Team
This problem has been fixed in the Filter Design Toolbox 2.2 (R13).
If you are using a previous version, there are no known workarounds.

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