diff --git a/src/Glpi/Form/ConditionalVisiblity/ConditionData.php b/src/Glpi/Form/ConditionalVisiblity/ConditionData.php
index 1afeb55d19f..5c0af5c55fe 100644
--- a/src/Glpi/Form/ConditionalVisiblity/ConditionData.php
+++ b/src/Glpi/Form/ConditionalVisiblity/ConditionData.php
@@ -79,6 +79,6 @@ public function getValueOperator(): ?ValueOperator
     {
         // No follback here as an empty value is valid if the condition is not
         // fully specified yet.
-        return ValueOperator::tryFrom($this->value_operator);
+        return ValueOperator::tryFrom($this->value_operator ?? "");
     }
 }