diff --git a/actions/class.RestQtiTests.php b/actions/class.RestQtiTests.php
index 4f0b14a1e..577c0057b 100644
--- a/actions/class.RestQtiTests.php
+++ b/actions/class.RestQtiTests.php
@@ -367,11 +367,7 @@ private function getOverwriteTestUri(): ?string
     {
         $overwriteTestUri = $this->getPostParameter(self::OVERWRITE_TEST_URI);
 
-        if (is_null($overwriteTestUri)) {
-            return null;
-        }
-
-        if (!is_string($overwriteTestUri)) {
+        if (!is_null($overwriteTestUri) && !is_string($overwriteTestUri)) {
             throw new common_exception_RestApi(
                 sprintf('%s parameter should be string', self::OVERWRITE_TEST_URI)
             );
diff --git a/models/classes/class.QtiTestService.php b/models/classes/class.QtiTestService.php
index a5067fbdc..d521620d9 100644
--- a/models/classes/class.QtiTestService.php
+++ b/models/classes/class.QtiTestService.php
@@ -806,8 +806,9 @@ protected function importTest(
                             $this->importTestAuxiliaryFiles($testContent, $qtiTestResource, $folder, $report);
 
                             // 3. Give meaningful names to resources.
-                            $testResource->setLabel($newPackageLabel ?? $testDefinition->getDocumentComponent()->getTitle());
-                            $targetItemClass->setLabel($newPackageLabel ?? $testDefinition->getDocumentComponent()->getTitle());
+                            $testDefinitionTitle = $testDefinition->getDocumentComponent()->getTitle();
+                            $testResource->setLabel($newPackageLabel ?? $testDefinitionTitle);
+                            $targetItemClass->setLabel($newPackageLabel ?? $testDefinitionTitle);
 
                             // 4. Import metadata for the resource (use same mechanics as item resources).
                             // Metadata will be set as property values.
diff --git a/models/classes/import/QtiTestImporter.php b/models/classes/import/QtiTestImporter.php
index f9ef3ea60..c39cacdba 100644
--- a/models/classes/import/QtiTestImporter.php
+++ b/models/classes/import/QtiTestImporter.php
@@ -51,10 +51,10 @@ class QtiTestImporter extends AbstractTestImporter
     public function import(
         File $file,
         core_kernel_classes_Class $class = null,
-        bool $enableMetadataGuardians = true,
-        bool $enableValidators = true,
-        bool $itemMustExist = false,
-        bool $itemMustBeOverwritten = false,
+        $enableMetadataGuardians = true,
+        $enableValidators = true,
+        $itemMustExist = false,
+        $itemMustBeOverwritten = false,
         bool $overwriteTest = false,
         ?string $itemClassUri = null,
         ?string $newPackageLabel = null,