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I have processed same issue recently regarding the topic, so post it here in case you face it.

Description:

Backend error occurred (Received “failed to fire action: argument not found” …) on webgui in-placed in Portal.
The issue could be reproduced when you hide/expand the side panel of Portal by the expand navigation button to resize webgui,
see following picture for reference.

SidePanel.png

Following screenshot shows the detailed error message.

ERR.png

Solution:

The issue is documented in SAP Note 2195859 SAP GUI for HTML: “failed to fire action: argument not found” on resizing.
Correction is with a later Kernel patch, see the Note for detailed patch level.

https://service.sap.com/sap/support/notes/2195859

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