diff --git a/webservice/soap/classes/class.ilSoapTestAdministration.php b/webservice/soap/classes/class.ilSoapTestAdministration.php
index 2248d28d01d9..60f609cfe8ab 100644
--- a/webservice/soap/classes/class.ilSoapTestAdministration.php
+++ b/webservice/soap/classes/class.ilSoapTestAdministration.php
@@ -688,13 +688,13 @@ public function getTestResults(string $sid, int $test_ref_id, bool $sum_only)
             foreach ($data as $row) {
                 $xmlRow = new ilXMLResultSetRow();
                 $xmlRow->setValue(0, $row["user_id"]);
-                $xmlRow->setValue(1, $row["login"]);
-                $xmlRow->setValue(2, $row["firstname"]);
-                $xmlRow->setValue(3, $row["lastname"]);
-                $xmlRow->setValue(4, $row["matriculation"]);
-                $xmlRow->setValue(5, $row["max_points"]);
-                $xmlRow->setValue(6, $row["reached_points"]);
-                $xmlRow->setValue(7, $row["passed"]);
+                $xmlRow->setValue(1, $row["login"] ? (string) $row["login"] : "");
+                $xmlRow->setValue(2, $row["firstname"] ? (string) $row["firstname"] : "");
+                $xmlRow->setValue(3, $row["lastname"] ? (string) $row["lastname"] : "");
+                $xmlRow->setValue(4, $row["matriculation"] ? (string) $row["matriculation"] : "");
+                $xmlRow->setValue(5, $row["max_points"] ? (float) $row["max_points"]  : "");
+                $xmlRow->setValue(6, $row["reached_points"] ? (float) $row["reached_points"] : "");
+                $xmlRow->setValue(7, $row["passed"] ? (int) $row["passed"] : 0);
                 $xmlResultSet->addRow($xmlRow);
             }
         } else {
@@ -708,15 +708,15 @@ public function getTestResults(string $sid, int $test_ref_id, bool $sum_only)
             foreach ($data as $row) {
                 $xmlRow = new ilXMLResultSetRow();
                 $xmlRow->setValue(0, $row["user_id"]);
-                $xmlRow->setValue(1, $row["login"]);
-                $xmlRow->setValue(2, $row["firstname"]);
-                $xmlRow->setValue(3, $row["lastname"]);
-                $xmlRow->setValue(4, $row["matriculation"]);
-                $xmlRow->setValue(5, $row["question_id"]);
-                $xmlRow->setValue(6, $row["question_title"]);
-                $xmlRow->setValue(7, $row["max_points"]);
-                $xmlRow->setValue(8, $row["reached_points"]);
-                $xmlRow->setValue(9, $row["passed"]);
+                $xmlRow->setValue(1, $row["login"] ? (string) $row["login"] : "");
+                $xmlRow->setValue(2, $row["firstname"] ? (string) $row["firstname"] : "");
+                $xmlRow->setValue(3, $row["lastname"] ? (string) $row["lastname"] : "");
+                $xmlRow->setValue(4, $row["matriculation"] ? (string) $row["matriculation"] : "");
+                $xmlRow->setValue(5, $row["question_id"] ? (string) $row["question_id"] : "");
+                $xmlRow->setValue(6, $row["question_title"] ? (string) $row["question_title"] : "");
+                $xmlRow->setValue(7, $row["max_points"] ? (float) $row["max_points"]  : "");
+                $xmlRow->setValue(8, $row["reached_points"] ? (float) $row["reached_points"] : "");
+                $xmlRow->setValue(9, $row["passed"] ? (int) $row["passed"] : 0);
                 $xmlResultSet->addRow($xmlRow);
             }
         }