This error happens when hook_update_N() does not return an array. This caused by this:

Quick fix:

/**
 * See if Panels needs to operate in legacy rendering mode, and produce a
 * warning if it does.
 */
function panels_update_6307() {
+  return array();
}

Comments

vikingew’s picture

vikingew commented
Status: Needs review » Needs work

Full warning returned:

    * warning: array_merge() [function.array-merge]: Argument #2 is not an array in /path/to/update.php on line 174.
    * warning: Invalid argument supplied for foreach() in /path/to/update.php on line 338.

it also produces this message in the status report:

Panels operating in Legacy mode	
Panels is operating in Legacy mode due to the following issues:

The above quick fix removes the warning but status report still report that "Panels operates in Legacy mode ..." so more work needs to be done.

merlinofchaos’s picture

merlinofchaos commented
Status: Needs work » Needs review

The legacy mode warning indicates you have styles that are not updated to the newest format. Since the newest format is currently only in -dev, this is not at all unexpected. That isn't related to this patch at all.

vikingew’s picture

vikingew commented
Status: Needs review » Reviewed & tested by the community

Ok in such case I would say it's rtbc

merlinofchaos’s picture

merlinofchaos commented
Status: Reviewed & tested by the community » Fixed

This got rolled in during a larger commit.

Status: Fixed » Closed (fixed)

Automatically closed -- issue fixed for 2 weeks with no activity.