diff --git a/setup/wizardsteps/WizStepModulesChoice.php b/setup/wizardsteps/WizStepModulesChoice.php
index 3f829bc45a..567c5f6ea8 100644
--- a/setup/wizardsteps/WizStepModulesChoice.php
+++ b/setup/wizardsteps/WizStepModulesChoice.php
@@ -750,7 +750,7 @@ EOF
 		$bSelected = isset($aSelectedComponents[$sChoiceId]) && ($aSelectedComponents[$sChoiceId] === $sChoiceId);
 		$bMissingFromDisk = isset($aChoice['missing']) && $aChoice['missing'] === true;
 		$bMandatory = (isset($aChoice['mandatory']) && $aChoice['mandatory']);
-		$bInstalled = $bMissingFromDisk || $oITopExtension->bInstalled;
+		$bInstalled = $bMissingFromDisk || $oITopExtension?->bInstalled ?? false;
 		$bDependencyIssue = $oITopExtension?->HasDependencyIssue() ?? false;
 
 		$bChecked = $bSelected;
diff --git a/tests/php-unit-tests/unitary-tests/setup/WizStepModulesChoiceTest.php b/tests/php-unit-tests/unitary-tests/setup/WizStepModulesChoiceTest.php
index b0b8618bfd..66dd565c54 100644
--- a/tests/php-unit-tests/unitary-tests/setup/WizStepModulesChoiceTest.php
+++ b/tests/php-unit-tests/unitary-tests/setup/WizStepModulesChoiceTest.php
@@ -78,9 +78,6 @@ class WizStepModulesChoiceTest extends ItopTestCase
 			],
 			'A missing extension should be disabled and unchecked' => [
 				'aExtensionsOnDiskOrDb' => [
-					'itop-ext1' => [
-						'installed' => false,
-					],
 				],
 				'aWizardStepDefinition' => [
 					'extension_code' => 'itop-ext1',
@@ -102,9 +99,6 @@ class WizStepModulesChoiceTest extends ItopTestCase
 			],
 			'A missing extension should always be disabled and unchecked, even when mandatory' => [
 				'aExtensionsOnDiskOrDb' => [
-					'itop-ext1' => [
-						'installed' => false,
-					],
 				],
 				'aWizardStepDefinition' => [
 					'extension_code' => 'itop-ext1',
@@ -126,9 +120,6 @@ class WizStepModulesChoiceTest extends ItopTestCase
 			],
 			'A missing extension should always be disabled and unchecked, even when non-uninstallable' => [
 				'aExtensionsOnDiskOrDb' => [
-					'itop-ext1' => [
-						'installed' => false,
-					],
 				],
 				'aWizardStepDefinition' => [
 					'extension_code' => 'itop-ext1',