--- class.tslib_content_content.php.bak	2014-02-25 14:36:38.000000000 +0100
+++ class.tslib_content_content.php	2014-02-25 14:43:27.000000000 +0100
@@ -140,6 +140,9 @@ class tslib_content_Content extends tsli
 								$cObj->start($row, $conf['table']);
 								$tmpValue = $cObj->cObjGetSingle($renderObjName, $renderObjConf, $renderObjKey);
 								$cobjValue .= $tmpValue;
+							} else {
+								//debug($conf['table'] . ':' . $row['uid'], 'Content already being rendered!');
+								$cobjValue .= '<div class="alert alert-danger">The content element <b>' . ($conf['table'] . ':' . $row['uid']) . '</b> has already being rendered! See tslib/content/class.tslib_content_content.php and <a href="http://forge.typo3.org/issues/20541">issue 20541</a> on forge.</div>';
 							}
 						}
 					}
--- class.tslib_content_records.php.bak	2014-02-25 14:36:23.000000000 +0100
+++ class.tslib_content_records.php	2014-02-25 14:42:55.000000000 +0100
@@ -124,6 +124,9 @@ class tslib_content_Records extends tsli
 						$cObj->start($row, $val['table']);
 						$tmpValue = $cObj->cObjGetSingle($renderObjName, $renderObjConf, $renderObjKey);
 						$theValue .= $tmpValue;
+					} else {
+						//debug($val['table'] . ':' . $val['id'], 'Record already being rendered!');
+						$theValue .= '<div class="alert alert-danger">The record <b>' . ($val['table'] . ':' . $val['id']) . '</b> has already being rendered! See tslib/content/class.tslib_content_records.php and <a href="http://forge.typo3.org/issues/20541">issue 20541</a> on forge.</div>';
 					}
 				}
 			}