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[#47526] - [6.1 RC2] Error with debug plugin 'Query Explain' = Show

No Code Attached Yet bug
avatar Ruud68
Ruud68
1 Apr 2026

in Joomla 6.1 RC1 and RC2 and RC3

  1. enable in global config: System > Debug System = Yes
  2. in plugin debug > set Query Explains = Show
  3. return to Joomla Home Dashboard

All ajax calls now fail with error 500, see attached image

Image
avatar Ruud68 Ruud68 - open - 1 Apr 2026
avatar Ruud68 Ruud68 - change - 1 Apr 2026
Labels Removed: ?
avatar joomla-cms-bot joomla-cms-bot - change - 1 Apr 2026
Labels Added: No Code Attached Yet
avatar joomla-cms-bot joomla-cms-bot - labeled - 1 Apr 2026
avatar Ruud68 Ruud68 - change - 1 Apr 2026
The description was changed
avatar Ruud68 Ruud68 - edited - 1 Apr 2026
avatar Ruud68 Ruud68 - change - 9 Apr 2026
The description was changed
avatar Ruud68 Ruud68 - edited - 9 Apr 2026
avatar Ruud68 Ruud68 - change - 9 Apr 2026
Title
…
Error with debug plugin 'Query Explain' = Show
[6.1 RC2] Error with debug plugin 'Query Explain' = Show
avatar Ruud68 Ruud68 - edited - 9 Apr 2026
avatar Ruud68 Ruud68 - change - 13 Apr 2026
The description was changed
avatar Ruud68 Ruud68 - edited - 13 Apr 2026
avatar hiteshm0
hiteshm0 - comment - 14 Apr 2026

perhaps #46862 is relevant here.

If i revert the changes made to plugins/system/fields/services/provider.php i.e debug plugin is no longer lazy loaded then this bug disappears.

another observation is that i am only able to reproduce this issue while using php 8.5 and not php 8.3

avatar Fedik Fedik - change - 15 Apr 2026
Labels Added: bug
avatar Fedik Fedik - labeled - 15 Apr 2026
avatar alikon alikon - change - 12 May 2026
Status New ⇒ Closed
Closed_Date 0000-00-00 00:00:00 ⇒ 2026-05-12 18:27:56
Closed_By ⇒ alikon
avatar alikon alikon - close - 12 May 2026
avatar alikon
alikon - comment - 12 May 2026

fixed by #47601

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