Wireshark crashes with "Gtk-ERROR **: Byte index 6 is off the end of the line" if click on last PDU

This issue was migrated from bug 5285 in our old bug tracker.

Original bug information:

Reporter: gab…@‍gma…
Status: RESOLVED FIXED
Product: Wireshark
Component: GTK+ UI
OS: All
Platform: x86
Version: Git

Attachments:

wireshark_crash.pcap: The pcap file to replicate the crash
: The screenshot with text explaining how to reproduce
bug5285.patch: Proposed patch that fixes this issue