[Bug] Multiple critical errors on PHP 8.x – album save, image upload, and album delete fail (ImageGallery Pro v1.5.0 / Bludit 3.19.0)

[TestDesk]

Environment

Bludit version	3.19.0
Plugin	ImageGallery Pro v1.5.0
PHP version	8.2.30
Web server	Apache

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Description

After installing and activating the plugin, the following operations all produce error messages in the UI, although the actions are partially executed server-side:

• Create album → "Error: Could not save album settings." (album appears after page reload)
• Upload image → "Invalid JSON response from server." (thumbnail shows with ❌, image name appears after reload but image is not displayed, clicking shows "Image not found, next image will be loaded")
• Delete album → "Error: Album could not be deleted." (album is gone after page reload)

The root cause in all cases is that PHP fatal errors and warnings corrupt the JSON response before it reaches the client.

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Steps to Reproduce

1. Install Bludit 3.19.0 on a server running PHP 8.2.x
2. Install and activate ImageGallery Pro v1.5.0
3. Navigate to the plugin in the admin panel → tab "Images"
4. Click "Add Album", enter a name, click "Save" → error appears
5. Open the album, try to upload an image → error appears, thumbnail shows ❌
6. Reload the page → image name is listed but not displayed, clicking shows "Image not found"
7. Try to delete the album → error appears, album is gone after reload

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PHP Error Log

[php:error] PHP Fatal error: Uncaught DivisionByZeroError: Division by zero
  in .../vendors/SimpleImage.php:1272
Stack trace:
  #0 .../vendors/novaImage.php(27): claviska\SimpleImage->thumbnail()
  #1 .../ajax/helper.php(112): novafacile\novaImage->resize()
  #2 .../ajax/request.php(74): uploadImage()
  #3 {main}

[php:warn] PHP Warning: Undefined array key "test"
  in .../plugin.php on line 173

[php:warn] PHP Warning: Trying to access array offset on value of type null
  in .../plugin.php on line 175

[php:warn] PHP Warning: Undefined array key "title"
  in .../plugin.php on line 195

[php:warn] PHP Warning: Undefined array key "sort"
  in .../plugin.php on line 199

[php:warn] PHP Warning: Undefined array key "test"
  in .../app/BluditImageGalleryAdmin.php on line 22

[php:warn] PHP Warning: Trying to access array offset on value of type null
  in .../app/BluditImageGalleryAdmin.php on line 22

[php:warn] PHP Warning: Undefined array key "test"
  in .../app/BluditImageGallery.php on line 88

[php:warn] PHP Warning: Trying to access array offset on value of type null
  in .../app/BluditImageGallery.php on line 88

[php:warn] PHP Warning: file_put_contents(
  .../bl-content/workspaces/imagegallery-pro/album-pages.json):
  Failed to open stream: No such file or directory
  in .../ajax/Config.php on line 55

[php:error] PHP Fatal error: Uncaught Error: Class "Log" not found
  in .../ajax/Config.php:58
Stack trace:
  #0 .../ajax/helper.php(130): Config->save()
  #1 .../ajax/request.php(60): removeAlbum()
  #2 {main}

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Root Causes Identified

1. DivisionByZeroError in SimpleImage.php:1272 – thumbnail generation crashes during image upload; the PHP fatal error corrupts the JSON response, causing the "Invalid JSON response from server" error in the UI. The image file may be partially saved but no thumbnail is generated.

2. Undefined array key warnings in plugin.php, BluditImageGallery.php, BluditImageGalleryAdmin.php – PHP 8.0 changed the behavior for undefined array key access (previously silent, now emits warnings). These warnings are output before the JSON response and break JSON parsing on the client side.

3. Missing directory bl-content/workspaces/imagegallery-pro/ – file_put_contents() fails because the directory is not created during plugin installation/activation.

4. Class "Log" not found in ajax/Config.php:58 – Bludit's Log class is not loaded in the AJAX context. This causes a fatal error when attempting to delete an album, which again corrupts the JSON response.

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Expected Behavior

All operations (create album, upload image, delete album) should complete without errors and the UI should reflect the changes immediately without requiring a page reload.

Actual Behavior

All write operations return error messages in the UI. The operations are partially executed server-side and only visible after a manual page reload.

Notes

• The "Settings" tab and "ImageGallery Pro" tab save correctly without errors – only operations that go through the AJAX handlers in ajax/request.php are affected.
• No configuration errors on the user side – this is reproducible on a clean installation.

[david-novafacile]

In some cases it works, in some cases the bug appaers, depending on the setup. Bludit has changed the session and AJAX handling. Analyses and fix is ongoing.

[david-novafacile]

New Version should work in most cases. For some edge cases bugfix is still in progress.

[TestDesk]

[Bug] Issues persist in v1.5.1 – tested on clean Bludit 3.19.0 installation

Environment

Bludit version	3.19.0 (clean installation)
Plugin	ImageGallery Pro v1.5.1
PHP version	8.2.30
Web server	Apache

---

Description

Tested on a completely fresh Bludit 3.19.0 installation with ImageGallery Pro v1.5.1. Several issues persist.

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What works

• Plugin installation and activation
• Saving settings in the "ImageGallery Pro" tab
• Saving settings in the "Settings" tab
• Entering and saving the gallery page in "Settings"
• Gallery page is rendered in the frontend with the gallery title
• Deleting images via the trash icon works without errors – files are removed from the server

---

What does not work

1. Create Album

Clicking "Save" after entering an album name returns:

"Error: Could not save album settings."

The album is not visible until the page is manually reloaded.

2. Album Settings not saved

When opening an album and trying to save settings (e.g. selecting the page where the gallery should be displayed), the same error appears:

"Error: Could not save album settings."

After confirming and reloading the page, none of the entered settings have been saved.

3. Image upload – thumbnails not generated

After uploading images, the UI shows a checkmark indicating success. However, after reloading the page:

• Only placeholder icons are shown instead of thumbnails
• The filenames are displayed correctly
• Clicking a placeholder shows: "Image not found, next image will be loaded"
• The cache/thumb/ directory is created on the server, but it remains empty – no thumbnail files are generated

4. Frontend – no images displayed

When visiting the gallery page in the frontend:

• Albums are shown as placeholders only, no thumbnails
• Clicking on an album shows only image placeholders, no actual images

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Server-side observation

• Original image files are correctly saved to bl-content/imagegallery/[albumname]/
• The cache/thumb/ directory is created but remains empty
• No thumbnail files are generated at any point

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Notes

• All tab-level settings ("Settings", "ImageGallery Pro") save correctly

[david-novafacile]

Can you please provide some more details?

• Do you use SSL or without SSL
• did you set an url in Bludit settings or is it empty?
• Do you have installed php gd-lib? This is required for thumbnail generating (is also required for Bludit)

[TestDesk]

1. SSL: Yes, HTTPS
2. Bludit URL: Yes, URL is set in Bludit settings
3. PHP GD:

/etc/php/8.2/cli/conf.d/20-gd.ini,
gd
GD Support => enabled
GD headers Version => 2.3.3
GD library Version => 2.3.3
gd.jpeg_ignore_warning => On => On

[TestDesk]

Hi, just a quick check-in – any progress on the fix? And do you have an idea when it might be working again? 🙂