Drupal stops when dpm($element)

Hi, I use it in VBO, and it printed this error:
An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows. Path: http://2lfuk.localhost/en/batch?id=39967&op=do StatusText: OK ResponseText: */ /* -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- */ ul.krumo-node { margin: 0px; padding: 0px; } ul.krumo-node ul { margin-left: 20px; } * html ul.krumo-node ul { margin-left: 24px; } div.krumo-root { border: solid 1px black; margin: 1em 0em; } ul.krumo-first { font: normal 12px arial; border: solid 2px white; border-top-width:1px; background: url(http://2lfuk.localhost/sites/all/modules/contrib/devel/krumo/skins/orange/bg.gif); } /* -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- */ li.krumo-child { display:block; list-style: none; padding: 0px; margin: 0px; overflow:hidden; } div.krumo-element { cursor:default; line-height: 24px; display:block; clear:both; white-space:nowrap; border-top: solid 1px white; background: #FCEBA9; padding-left: 10px; } * html div.krumo-element { padding-bottom: 3px; } a.krumo-name { color:#404000; font: bold 13px Arial; } a.krumo-name big { font: bold 20pt Georgia; line-height: 14px; position:relative; top:2px; left:-2px; } * html a.krumo-name big { font: bold 19pt Georgia; top: 5px; left: 0px; line-height: 9px; height: 12px; padding: 0px; margin: 0px; } div.krumo-expand { background: #FADB61; cursor:pointer; } div.krumo-hover { background: #FF8A4B; } /* -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- */ div.krumo-preview { font: normal 13px courier new; padding: 5px 5px 14px 5px; background: white; border-top: 0px; overflow:auto; white-space: pre; } * html div.krumo-preview { padding-top: 2px; } /* -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- */ li.krumo-footnote { background:white; padding: 2px 5px; list-style:none; border-top: solid 1px #bebebe; margin-top:2px; cursor:default; } * html li.krumo-footnote { line-height: 13px; } div.krumo-version { float:right; } li.krumo-footnote h6 { font: bold 11px verdana; margin: 0px; padding: 0px; color:#E87400; display:inline; } * html li.krumo-footnote h6 { margin-right: 3px; } li.krumo-footnote a { font: bold 10px arial; color: #434343; text-decoration:none; } li.krumo-footnote a:hover { color:black; } li.krumo-footnote span.krumo-call { font:normal 11px verdana; position: relative; top: 1px; } li.krumo-footnote span.krumo-call code { font-weight:bold; } /* -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- */ div.krumo-title { font: normal 11px verdana ; position:relative; top:9px; cursor:default; line-height:2px; } /* -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- */ strong.krumo-array-length, strong.krumo-string-length { font-weight: normal; } /* -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- */ /**/--> -1) { el.className = el.className.replace(className, ''); } } // -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- /** * Toggle the nodes connected to an HTML element * * @param HtmlElement el * @return void */ krumo.toggle = function(el) { var ul = el.parentNode.getElementsByTagName('ul'); for (var i=0; i ... (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 1 characters ) a attr (Array, 2 elements) href (String, 30 characters ) /Informace/medailon/strnad.htm children (Array, 0 elements) nodes (Array, 1 element) 0 (Object) simple_html_dom_node nodetype (Integer) 3 tag (String, 4 characters ) text attr (Array, 1 element) children (Array, 0 elements) nodes (Array, 0 elements) parent (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 1 characters ) a attr (Array, 2 elements) href (String, 30 characters ) /Informace/medailon/strnad.htm children (Array, 0 elements) nodes (Array, 2 elements) ∞ (Recursion) parent (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 1 characters ) p attr (Array, 2 elements) class (String, 1 characters ) j children (Array, 7 elements) 0 (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 3 characters ) img attr (Array, 5 elements) src (String, 27 characters ) /Aktuality/nove/img/prs.jpg width (String, 3 characters ) 240 heught (String, 3 characters ) 359 class (String, 9 characters ) praft brd children (Array, 0 elements) nodes (Array, 0 elements) parent (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 1 characters ) p attr (Array, 2 elements) class (String, 1 characters ) j children (Array, 8 elements) ∞ (Recursion) nodes (Array, 13 elements) 0 (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 3 characters ) img attr (Array, 5 elements) src (String, 27 characters ) /Aktuality/nove/img/prs.jpg width (String, 3 characters ) 240 heught (String, 3 characters ) 359 class (String, 9 characters ) praft brd children (Array, 0 elements) nodes (Array, 0 elements) parent (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 1 characters ) p attr (Array, 2 elements) class (String, 1 characters ) j children (Array, 8 elements) ∞ (Recursion) nodes (Array, 14 elements) ∞ (Recursion) parent (Object) simple_html_dom_node nodetype (Integer) 5 tag (String, 4 characters ) root attr (Array, 1 element) children (Array, 2 elements) 0 (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 2 characters ) h4 attr (Array, 2 elements) class (String, 1 characters ) c children (Array, 0 elements) nodes (Array, 1 element) 0 (Object) simple_html_dom_node nodetype (Integer) 3 tag (String, 4 characters ) text attr (Array, 1 element) children (Array, 0 elements) nodes (Array, 0 elements) parent (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 2 characters ) h4 attr (Array, 2 elements) class (String, 1 characters ) c children (Array, 0 elements) nodes (Array, 2 elements) ∞ (Recursion) parent (Object) simple_html_dom_node nodetype (Integer) 5 tag (String, 4 characters ) root attr (Array, 1 element) children (Array, 3 elements) ∞ (Recursion) nodes (Array, 4 elements) 0 (Object) simple_html_dom_node nodetype (Integer) 1 tag (String, 2 characters ) h4 attr (Array, 2 elements) class (String, 1 characters ) c children (Array, 0 elements) nodes (Array, 2 elements) ∞ (Recursion) parent (Object) simple_html_dom_node nodetype (Integer) 5 tag (String, 4 characters ) root attr (Array, 1 element) ( ! ) Fatal error: Maximum function nesting level of '100' reached, aborting! in /Users/Bobik/Sites/2lfuk/sites/all/modules/contrib/devel/krumo/class.krumo.php on line 921 Call Stack #TimeMemoryFunctionLocation 10.0011241912{main}( )../index.php:0 23.29317938552menu_execute_active_handler( )../index.php:21 33.29387982320call_user_func_array ( )../menu.inc:517 43.29387982488system_batch_page( )../menu.inc:517 53.29387982544_batch_page( )../system.admin.inc:2377 63.29397983472_batch_do( )../batch.inc:80 73.29407983536_batch_process( )../batch.inc:161 83.29628039512call_user_func_array ( )../batch.inc:284 93.29628039560views_bulk_operations_active_queue_process( )../batch.inc:284 103.33938052456views_bulk_operations_queue_item_process( )../views_bulk_operations.module:974 113.45448622240ViewsBulkOperationsRulesComponent->execute( )../views_bulk_operations.module:1065 123.607510899976RulesPlugin->execute( )../rules_component.class.php:127 133.607610900368RulesAbstractPlugin->executeByArgs( )../rules.core.inc:577 143.618011696160RulesAbstractPlugin->evaluate( )../rules.core.inc:1638 153.618411698376RulesAction->executeCallback( )../rules.core.inc:1659 163.618411699328RulesExtendable->__call( )../rules.plugins.inc:20 173.618411699376FacesExtendable->__call( )../rules.core.inc:362 183.619211777192call_user_func_array ( )../faces.inc:123 193.619211777712rules_element_invoke_component( )../faces.inc:123 203.621611795464RulesActionContainer->evaluate( )../rules_core.eval.inc:35 213.621611795512RulesAbstractPlugin->evaluate( )../rules.core.inc:2435 223.622211799224RulesAction->executeCallback( )../rules.core.inc:1659 233.622211799304RulesExtendable->__call( )../rules.plugins.inc:20 243.622211799304FacesExtendable->__call( )../rules.core.inc:362 253.622711800712call_user_func_array ( )../faces.inc:123 263.622711801432lfuk2_imports_action_process_body( )../faces.inc:123 273.643311859632dpm( )../lfuk2_imports.rules.inc:65 283.643311859816kprint_r( )../devel.module:1863 293.644211880216krumo_ob( )../devel.module:1927 303.644211896840krumo( )../devel.module:1469 313.644211897760call_user_func_array ( )../class.krumo.php:1312 323.644211898096krumo::dump( )../class.krumo.php:1312 333.683011944720krumo::_dump( )../class.krumo.php:584 343.683011945120krumo::_object( )../class.krumo.php:794 353.683111945192krumo::_vars( )../class.krumo.php:1112 363.684811951264krumo::_dump( )../class.krumo.php:1001 373.684811951264krumo::_array( )../class.krumo.php:824 383.684911951264krumo::_vars( )../class.krumo.php:1080 393.685211952840krumo::_dump( )../class.krumo.php:1001 403.685211952840krumo::_object( )../class.krumo.php:794 413.685311952840krumo::_vars( )../class.krumo.php:1112 423.686911959280krumo::_dump( )../class.krumo.php:1001 433.686911959280krumo::_object( )../class.krumo.php:794 443.687011959280krumo::_vars( )../class.krumo.php:1112 453.689211962032krumo::_dump( )../class.krumo.php:1001 463.689211962032krumo::_object( )../class.krumo.php:794 473.689311962032krumo::_vars( )../class.krumo.php:1112 483.690711967144krumo::_dump( )../class.krumo.php:1001 493.690711967144krumo::_array( )../class.krumo.php:824 503.690811967144krumo::_vars( )../class.krumo.php:1080 513.691111969536krumo::_dump( )../class.krumo.php:1001 523.691211969536krumo::_object( )../class.krumo.php:794 533.691211969536krumo::_vars( )../class.krumo.php:1112 543.693811991456krumo::_dump( )../class.krumo.php:1001 553.693811991456krumo::_object( )../class.krumo.php:794 563.693911991456krumo::_vars( )../class.krumo.php:1112 573.695811994160krumo::_dump( )../class.krumo.php:1001 583.695911994160krumo::_array( )../class.krumo.php:824 593.696011994160krumo::_vars( )../class.krumo.php:1080 603.696311997432krumo::_dump( )../class.krumo.php:1001 613.696311997432krumo::_object( )../class.krumo.php:794 623.696411997432krumo::_vars( )../class.krumo.php:1112 633.700012000432krumo::_dump( )../class.krumo.php:1001 643.700112000432krumo::_object( )../class.krumo.php:794 653.700112000432krumo::_vars( )../class.krumo.php:1112 663.702512003184krumo::_dump( )../class.krumo.php:1001 673.702512003184krumo::_object( )../class.krumo.php:794 683.702612003184krumo::_vars( )../class.krumo.php:1112 693.703712008912krumo::_dump( )../class.krumo.php:1001 703.703712008912krumo::_array( )../class.krumo.php:824 713.703812008912krumo::_vars( )../class.krumo.php:1080 723.704212010624krumo::_dump( )../class.krumo.php:1001 733.704212010624krumo::_object( )../class.krumo.php:794 743.704312010624krumo::_vars( )../class.krumo.php:1112 753.705912015976krumo::_dump( )../class.krumo.php:1001 763.706012015976krumo::_array( )../class.krumo.php:824 773.706212032360krumo::_vars( )../class.krumo.php:1080 783.706512033936krumo::_dump( )../class.krumo.php:1001 793.706512033936krumo::_object( )../class.krumo.php:794 803.706612033936krumo::_vars( )../class.krumo.php:1112 813.708312040376krumo::_dump( )../class.krumo.php:1001 823.708312040376krumo::_object( )../class.krumo.php:794 833.708412040376krumo::_vars( )../class.krumo.php:1112 843.710612043128krumo::_dump( )../class.krumo.php:1001 853.710612043128krumo::_object( )../class.krumo.php:794 863.710712043128krumo::_vars( )../class.krumo.php:1112 873.712312045832krumo::_dump( )../class.krumo.php:1001 883.712412045832krumo::_array( )../class.krumo.php:824 893.712512045832krumo::_vars( )../class.krumo.php:1080 903.712812047816krumo::_dump( )../class.krumo.php:1001 913.712912047816krumo::_object( )../class.krumo.php:794 923.712912047816krumo::_vars( )../class.krumo.php:1112 933.715112050944krumo::_dump( )../class.krumo.php:1001 943.715112050944krumo::_object( )../class.krumo.php:794 953.715212050944krumo::_vars( )../class.krumo.php:1112 963.716212053392krumo::_dump( )../class.krumo.php:1001 973.716212053392krumo::_array( )../class.krumo.php:824 983.716412053392krumo::_vars( )../class.krumo.php:1080 993.716412053928krumo::_hive( )../class.krumo.php:968

Nothing in log.

So yes, it seems hitting maximum recursion level limit. But Krumo have some detection for it, so it does not work there for some reason.

I am not sure. It happens only for simple_html_dom_node, other objects with recursion are correctly handled.