Header Frame response not accepted

I am using testing my PMU using the test tool. I request Header Frame from PMU but the tool reacts in a manner I do not expect,

Command “SendHeaderFrame” requested at 5/20/2021 10:22:43 PM
Exception: Attempted to divide by zero.

Nothing appears in the “Header Frame” window pane, and no Header in the “Protocol Specific” pane.

I am using the latest version of the tool, v4.6.3.

Here’s a screen shot of the Wireshark response from my PMU to the tester:

image1293×891 86.8 KB

Can anyone spot an obvious error in my implementation of the Header frame response? Or could there be a configuration problem (user error)? Or maybe a bug in the tool?

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