Image Convert RGB operation causing errors when trying to open Batch Convert

[RadioactiveTurtle]

What went wrong?
Trying to use Batch Convert causes the plugin to hang and flood the error console with this before eventually dying:

Calling error for procedure 'gimp-image-convert-rgb':
Image '[Untitled]' (X) must not be of type 'rgb'

"X" is a number that increases by one with every error.

What should be the expected behavior?

The Batcher plugin window should open and proceed normally.

If you can, specify the steps to reproduce the problem.
I used an action to convert image color mode to RGB followed by an "exchange color" operation. It successfully batch converted a number of image files. I then quit out of the Batcher window, moved the images it saved elsewhere, and attempted to open Batcher again to convert other image files. Batcher locked up at this point and began spitting out errors.

Configuration

Version of Batcher: 1.2.1
Version of GIMP: 3.0.8
Operating system: Arch Linux
Installer: Package Manager https://archlinux.org/packages/extra/x86_64/gimp/

Additional information
No other actions were used. Conditions were left default.
The images I converted initially were saved as indexed PNG. I used the RGB convert operation to ensure that the exchange color operation would save the resulting colors correctly.

[kamilburda]

Based on the error message, I assume that some of the input images are already RGB images, which would
explain the error message. Does this also occur for indexed images?

By the way, you should be able to click the Stop button even if it looks like the dialog is not responsive (the plug-in is busy loading and processing the file, but will eventually stop before proceeding to the next file).

[RadioactiveTurtle]

Based on the error message, I assume that some of the input images are already RGB images, which would explain the error message. Does this also occur for indexed images?

By the way, you should be able to click the Stop button even if it looks like the dialog is not responsive (the plug-in is busy loading and processing the file, but will eventually stop before proceeding to the next file).

I can't change the input or any settings within the menu, as the Batch Convert window doesn't show anything and the errors seem to force focus away from other programs anyway. The errors start appearing as soon as I click "Batch Convert..." in the drop-down menu. If there's a file that stores the options, perhaps I could edit that to narrow down the issue?

[kamilburda]

This is definitely not meant to happen. I was not able to fully replicate this (the dialog being unresponsive completely), although I did notice the excessive warning dialogs on start, which can possibly cause the plug-in to hang on some setups.

For now, you can work around this by moving/renaming files that you added in Batch Convert so that the image preview does not automatically trigger the processing (and, in turn, the warnings).

You can also turn off the automatic preview update (it's under the arrow icon next to the Preview label) to prevent this from happening again for the time being.

I will try to fix the warning dialog spam in the next version, which should hopefully prevent locking up the main dialog.

If the workaround above doesn't work, you can reset Batch Convert manually as follows: Locate the parasiterc file above the plug-ins user folder, and remove the line starting with (parasite "plug-in-batch-convert".

[RadioactiveTurtle]

Yes, that does seem to be the issue. I used Batch Convert on several images, and then overwrote the originals with the output. Since the output files were now no longer indexed, it was trying to convert an already RGB image to RGB, and the automatic preview update caused it to constantly error and become unresponsive. The issue is easily worked around by moving the files elsewhere (or by renaming the folder containing them).
The reason for becoming unresponsive seems to be a result of the errors making a pop-up that auto-focuses. I remember reading something in relation to the error log that said error pop-ups aren't enabled by default. Not sure why they are showing up for me, or if it's a pop-up specific to that kind of error or something like that. Disabling automatic preview update feels like it should prevent the error spam, but it actually seems to begin spamming errors when trying to update manually anyway, though of course only when previewing an image that is already RGB.