diff --git a/include/class/card_property.class.php b/include/class/card_property.class.php
index 27132987e..b01dc73f6 100644
--- a/include/class/card_property.class.php
+++ b/include/class/card_property.class.php
@@ -184,7 +184,7 @@ class Card_Property
             } else {
                 // if there is a class base in fiche_def_ref, this account will be the
                 // the default one
-                if (strlen(trim($p_fiche_def->class_base)) != 0) {
+                if (noalyss_strlen(noalyss_trim($p_fiche_def->class_base)) != 0) {
                     $result['msg'] .= " <span style=\"color:red\">" . _("Rappel: Poste par défaut sera ") .
                         $p_fiche_def->class_base .
                         " !</span> ";
diff --git a/include/lib/ac_common.php b/include/lib/ac_common.php
index d4c594302..ad7629754 100644
--- a/include/lib/ac_common.php
+++ b/include/lib/ac_common.php
@@ -1579,6 +1579,16 @@ function add_http_link($text)
     return $ret;
 
 }
+//---------------------------------------------------------------------------------------------------------------------
+//
+// PHP 8.2 fails with these functions when a NULL is given as argument
+//
+//---------------------------------------------------------------------------------------------------------------------
+
+function noalyss_strlen($p_string) :int{
+    if (empty ($p_string) ) return 0;
+    else return strlen($p_string);
+}
 function noalyss_trim($p_string) {
     if ($p_string===null) return "";
     else return trim($p_string);
diff --git a/include/lib/inum.class.php b/include/lib/inum.class.php
index 28a50825e..78923e206 100644
--- a/include/lib/inum.class.php
+++ b/include/lib/inum.class.php
@@ -91,7 +91,7 @@ class INum extends IText
 
         $extra=(isset($this->extra))?$this->extra:"";
 
-        $this->value=str_replace('"', '', $this->value);
+        $this->value=noalyss_str_replace('"', '', $this->value);
         $strAttribute=$this->get_node_attribute();
         if (!isset($this->css_size)  || empty ($this->css_size))
         {