Unsupported operand types in public_html/includes/form.inc on line 2624

Turns out it's happening for all action types. This must be an issue in some other module.

Here is the code context around that error. 2624 is the $element['#options'] assignment near the end.

I'm wondering whether one of $empty_option or $element['#options'] is somehow NULL, and whether that matters.

  else {
    $required = $element['#required'];
    // If the element is required and there is no #default_value, then add an
    // empty option that will fail validation, so that the user is required to
    // make a choice. Also, if there's a value for #empty_value or
    // #empty_option, then add an option that represents emptiness.
    if (($required && !isset($element['#default_value'])) || isset($element['#empty_value']) || isset($element['#empty_option'])) {
      $element += array(
        '#empty_value' => '',
        '#empty_option' => $required ? t('- Select -') : t('- None -'),
      );
      // The empty option is prepended to #options and purposively not merged
      // to prevent another option in #options mistakenly using the same value  
      // as #empty_value.
      $empty_option = array($element['#empty_value'] => $element['#empty_option']);
      $element['#options'] = $empty_option + $element['#options'];
    }
  }
  return $element;

It's definitely as issue of $element['#options'] coming up blank. I'm trying to get this to work with Facebook Autopost. Here's a stack trace.

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /system/ajax
StatusText: OK
ResponseText: array(11) {
[0]=>
array(4) {
["file"]=>
string(44) "<PATH>/public_html/includes/form.inc"
["line"]=>
int(1802)
["function"]=>
string(19) "form_process_select"
["args"]=>
array(3) {
[0]=>
&array(25) {
["#type"]=>
string(6) "select"
["#options"]=>
NULL
["#title"]=>
string(5) "Value"
["#default_value"]=>
NULL
["#required"]=>
bool(true)
["#after_build"]=>
array(1) {
[0]=>
string(38) "rules_ui_element_fix_empty_after_build"
}
["#rows"]=>
int(3)
["#input"]=>
bool(true)
["#multiple"]=>
bool(false)
["#process"]=>
array(2) {
[0]=>
string(19) "form_process_select"
[1]=>
string(17) "ajax_process_form"
}
["#theme"]=>
string(6) "select"
["#theme_wrappers"]=>
array(1) {
[0]=>
string(12) "form_element"
}
["#pre_render"]=>
array(1) {
[0]=>
string(27) "ctools_dependent_pre_render"
}
["#defaults_loaded"]=>
bool(true)
["#tree"]=>
bool(true)
["#parents"]=>
array(4) {
[0]=>
string(9) "parameter"
[1]=>
string(5) "pages"
[2]=>
string(8) "settings"
[3]=>
string(5) "pages"
}
["#array_parents"]=>
array(4) {
[0]=>
string(9) "parameter"
[1]=>
string(5) "pages"
[2]=>
string(8) "settings"
[3]=>
string(5) "pages"
}
["#weight"]=>
int(0)
["#processed"]=>
bool(false)
["#attributes"]=>
array(0) {
}
["#title_display"]=>
string(6) "before"
["#id"]=>
string(35) "edit-parameter-pages-settings-pages"
["#name"]=>
string(33) "parameter[pages][settings][pages]"
["#needs_validation...erInterface"]=>
string(27) "RulesPluginHandlerInterface"
["RulesPluginFeaturesIntegrationInterace"]=>
string(38) "RulesPluginFeaturesIntegrationInterace"
["RulesPluginUIInterface"]=>
string(22) "RulesPluginUIInterface"
}
["facesIncludes":protected]=>
array(1) {
["execute"]=>
array(2) {
["module"]=>
string(18) "fb_autopost_entity"
["name"]=>
string(24) "fb_autopost_entity.rules"
}
}
["facesClassInstances":protected]=>
array(2) {
["RulesAbstractPluginUI"]=>
object(RulesAbstractPluginUI)#202 (2) {
["element":protected]=>
*RECURSION*
["object":protected]=>
*RECURSION*
}
["RulesAbstractPluginDefaults"]=>
object(RulesAbstractPluginDefaults)#233 (2) {
["element":protected]=>
*RECURSION*
["object":protected]=>
*RECURSION*
}
}
}
["element_settings"]=>
array(0) {
}
["parameter_mode"]=>
array(2) {
["publication"]=>
string(8) "selector"
["pages"]=>
string(5) "input"
}
}
}
}
[8]=>
array(2) {
["function"]=>
string(18) "ajax_form_callback"
["args"]=>
array(0) {
}
}
[9]=>
array(4) {
["file"]=>
string(44) "<PATH>/public_html/includes/menu.inc"
["line"]=>
int(517)
["function"]=>
string(20) "call_user_func_array"
["args"]=>
array(2) {
[0]=>
&string(18) "ajax_form_callback"
[1]=>
&array(0) {
}
}
}
[10]=>
array(4) {
["file"]=>
string(36) "<PATH>/public_html/index.php"
["line"]=>
int(21)
["function"]=>
string(27) "menu_execute_active_handler"
["args"]=>
array(0) {
}
}
}
bool(true)
Fatal error:  Unsupported operand types in /<PATH>/public_html/includes/form.inc on line 2626

I'm also getting "Cannot ask for user accounts without an access token." as an error occasionally at a watchdog style error, as has been mentioned elsewhere. Perhaps this is related to that.

The problem only occurs when Facebook Autopost Entity is enabled. Can I provide any more specific information? I'll be trying to dig deeper on this.

I got past the "Cannot ask for user accounts without an access token." issue. Doing this involved enabling fb_autopost first, and then configuring the FB app BEFORE later adding the entity module.

(Also, in order to get that to work, I needed to take the execution time limit for PHP off as well, as is mentioned in another issue: 2248453)