diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 06a5b21afbc..b4e028b2a5c 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -145,7 +145,8 @@ abstract class CommonObject
 
 	/**
 	 * @var array<string,array<string,string>>	Array to store alternative languages values of object
-	 * 											Note: call fetchValuesForExtraLanguages() before using this
+	 *
+	 * Note: call fetchValuesForExtraLanguages() before using this
 	 */
 	public $array_languages = null; // Value is array() when load already tried
 
@@ -3356,9 +3357,9 @@ abstract class CommonObject
 	/**
 	 * 	Get children of line
 	 *
-	 * 	@param	int			$id					Id of parent line
-	 * 	@param	int			$includealltree		0 = 1st level child, >0 = All level child
-	 * 	@return	int[]			            	Array with list of children lines id
+	 * 	@param	int			$id				Id of parent line
+	 * 	@param	int<0,1>	$includealltree	0 = 1st level child, 1 = All level child
+	 * 	@return	int[]						Array with list of children lines id
 	 */
 	public function getChildrenOfLine($id, $includealltree = 0)
 	{
@@ -8092,6 +8093,7 @@ abstract class CommonObject
 		$type  = empty($val['type']) ? '' : $val['type'];
 		$size  = empty($val['css']) ? '' : $val['css'];
 		$reg = array();
+		$value = '';  // Default return value
 
 		// Convert var to be able to share same code than showOutputField of extrafields
 		if (preg_match('/varchar\((\d+)\)/', $type, $reg)) {
@@ -8593,7 +8595,7 @@ abstract class CommonObject
 
 		$this->clearFieldError($fieldKey);
 
-		if (!isset($fields[$fieldKey])) {
+		if (!isset($fields[$fieldKey]) || $fields[$fieldKey] === null) {
 			$this->setFieldError($fieldKey, $langs->trans('FieldNotFoundInObject'));
 			return false;
 		}
@@ -8915,7 +8917,7 @@ abstract class CommonObject
 									$value = $getposttemp;
 								}
 							} elseif (in_array($extrafields->attributes[$this->table_element]['type'][$key], array('int'))) {
-								$value =( !empty($this->array_options["options_".$key]) || $this->array_options["options_".$key] === '0' ) ? $this->array_options["options_".$key] : '';
+								$value = (!empty($this->array_options["options_".$key]) || $this->array_options["options_".$key] === '0') ? $this->array_options["options_".$key] : '';
 							} else {
 								$value = (!empty($this->array_options["options_".$key]) ? $this->array_options["options_".$key] : ''); // No GET, no POST, no default value, so we take value of object.
 							}