diff --git a/Modules/TestQuestionPool/classes/class.assMultipleChoice.php b/Modules/TestQuestionPool/classes/class.assMultipleChoice.php
index d256c0868ad6..a81bb654e7c4 100755
--- a/Modules/TestQuestionPool/classes/class.assMultipleChoice.php
+++ b/Modules/TestQuestionPool/classes/class.assMultipleChoice.php
@@ -454,7 +454,7 @@ public function deleteAnswer($index = 0): void
             return;
         }
         $answer = $this->answers[$index];
-        if (strlen($answer->getImage())) {
+        if ($answer->hasImage()) {
             $this->deleteImage($answer->getImage());
         }
         unset($this->answers[$index]);
@@ -890,8 +890,8 @@ public function duplicateImages($question_id, $objectId = null): void
         }
 
         foreach ($this->answers as $answer) {
-            $filename = $answer->getImage();
-            if (strlen($filename)) {
+            if ($answer->hasImage()) {
+                $filename = $answer->getImage();
                 if (!file_exists($imagepath)) {
                     ilFileUtils::makeDirParents($imagepath);
                 }
@@ -935,8 +935,8 @@ public function copyImages($question_id, $source_questionpool): void
         $imagepath_original = str_replace("/$this->id/images", "/$question_id/images", $imagepath);
         $imagepath_original = str_replace("/$this->obj_id/", "/$source_questionpool/", $imagepath_original);
         foreach ($this->answers as $answer) {
-            $filename = $answer->getImage();
-            if (strlen($filename)) {
+            if ($answer->hasImage()) {
+                $filename = $answer->getImage();
                 if (!file_exists($imagepath)) {
                     ilFileUtils::makeDirParents($imagepath);
                 }
@@ -968,8 +968,8 @@ protected function syncImages(): void
 
         ilFileUtils::delDir($imagepath_original);
         foreach ($this->answers as $answer) {
-            $filename = $answer->getImage();
-            if (strlen($filename)) {
+            if ($answer->hasImage()) {
+                $filename = $answer->getImage();
                 if (@file_exists($imagepath . $filename)) {
                     if (!file_exists($imagepath)) {
                         ilFileUtils::makeDirParents($imagepath);
diff --git a/Modules/TestQuestionPool/classes/class.assSingleChoice.php b/Modules/TestQuestionPool/classes/class.assSingleChoice.php
index 6e926d4cf735..ebc50b7c024b 100755
--- a/Modules/TestQuestionPool/classes/class.assSingleChoice.php
+++ b/Modules/TestQuestionPool/classes/class.assSingleChoice.php
@@ -105,7 +105,7 @@ public function isComplete(): bool
     {
         if (strlen($this->title) and ($this->author) and ($this->question) and (count($this->answers)) and ($this->getMaximumPoints() > 0)) {
             foreach ($this->answers as $answer) {
-                if ((strlen($answer->getAnswertext()) == 0) && (strlen($answer->getImage()) == 0)) {
+                if ((strlen($answer->getAnswertext()) == 0) && !$answer->hasImage()) {
                     return false;
                 }
             }
@@ -890,8 +890,8 @@ public function duplicateImages($question_id, $objectId = null): void
         }
 
         foreach ($this->answers as $answer) {
-            $filename = $answer->getImage();
-            if (strlen($filename)) {
+            if ($answer->hasImage()) {
+                $filename = $answer->getImage();
                 if (!file_exists($imagepath)) {
                     ilFileUtils::makeDirParents($imagepath);
                 }
@@ -919,8 +919,8 @@ public function copyImages($question_id, $source_questionpool): void
         $imagepath_original = str_replace("/$this->id/images", "/$question_id/images", $imagepath);
         $imagepath_original = str_replace("/$this->obj_id/", "/$source_questionpool/", $imagepath_original);
         foreach ($this->answers as $answer) {
-            $filename = $answer->getImage();
-            if (strlen($filename)) {
+            if ($answer->hasImage()) {
+                $filename = $answer->getImage();
                 if (!file_exists($imagepath)) {
                     ilFileUtils::makeDirParents($imagepath);
                 }
@@ -968,8 +968,8 @@ protected function syncImages(): void
         $imagepath_original = str_replace("/$this->id/images", "/$question_id/images", $imagepath);
         ilFileUtils::delDir($imagepath_original);
         foreach ($this->answers as $answer) {
-            $filename = $answer->getImage();
-            if (strlen($filename)) {
+            if ($answer->hasImage()) {
+                $filename = $answer->getImage();
                 if (@file_exists($imagepath . $filename)) {
                     if (!file_exists($imagepath)) {
                         ilFileUtils::makeDirParents($imagepath);
diff --git a/Modules/TestQuestionPool/classes/export/qti12/class.assMultipleChoiceExport.php b/Modules/TestQuestionPool/classes/export/qti12/class.assMultipleChoiceExport.php
index e4354c85ff8d..172b2dc61d6b 100644
--- a/Modules/TestQuestionPool/classes/export/qti12/class.assMultipleChoiceExport.php
+++ b/Modules/TestQuestionPool/classes/export/qti12/class.assMultipleChoiceExport.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -15,6 +16,7 @@
  *
  *********************************************************************/
 
+
 /**
 * Class for multiple choice question exports
 *
@@ -122,7 +124,7 @@ public function toXML($a_include_header = true, $a_include_binary = true, $a_shu
             ];
             $a_xml_writer->xmlStartTag("response_label", $attrs);
 
-            if (strlen($answer->getImage())) {
+            if ($answer->hasImage()) {
                 $this->addQTIMaterial($a_xml_writer, $answer->getAnswertext(), false, false);
                 $imagetype = "image/jpeg";
                 if (preg_match("/.*\.(png|gif)$/", $answer->getImage(), $matches)) {
diff --git a/Modules/TestQuestionPool/classes/export/qti12/class.assSingleChoiceExport.php b/Modules/TestQuestionPool/classes/export/qti12/class.assSingleChoiceExport.php
index 22db5c392911..7c14d03d0f17 100644
--- a/Modules/TestQuestionPool/classes/export/qti12/class.assSingleChoiceExport.php
+++ b/Modules/TestQuestionPool/classes/export/qti12/class.assSingleChoiceExport.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * This file is part of ILIAS, a powerful learning management system
  * published by ILIAS open source e-Learning e.V.
@@ -15,6 +16,7 @@
  *
  *********************************************************************/
 
+
 /**
 * Class for single choice question exports
 *
@@ -126,7 +128,7 @@ public function toXML($a_include_header = true, $a_include_binary = true, $a_shu
             ];
             $a_xml_writer->xmlStartTag("response_label", $attrs);
 
-            if (strlen($answer->getImage())) {
+            if ($answer->hasImage()) {
                 $this->addQTIMaterial($a_xml_writer, $answer->getAnswertext(), false, false);
                 $imagetype = "image/jpeg";
                 if (preg_match("/.*\.(png|gif)$/", $answer->getImage(), $matches)) {
diff --git a/Modules/TestQuestionPool/classes/import/qti12/class.assMultipleChoiceImport.php b/Modules/TestQuestionPool/classes/import/qti12/class.assMultipleChoiceImport.php
index acc85d6d2cf5..a80f5069d598 100644
--- a/Modules/TestQuestionPool/classes/import/qti12/class.assMultipleChoiceImport.php
+++ b/Modules/TestQuestionPool/classes/import/qti12/class.assMultipleChoiceImport.php
@@ -223,7 +223,13 @@ public function fromXML(&$item, $questionpool_id, &$tst_id, &$tst_object, &$ques
             if ($item->getMetadataEntry('singleline') || (is_array($answer["imagefile"]) && count($answer["imagefile"]) > 0)) {
                 $this->object->setIsSingleline(true);
             }
-            $this->object->addAnswer($answer["answertext"], $answer["points"], $answer["points_unchecked"], $answer["answerorder"], $answer["imagefile"]["label"] ?? '');
+            $this->object->addAnswer(
+                $answer["answertext"],
+                $answer["points"],
+                $answer["points_unchecked"],
+                $answer["answerorder"],
+                $answer["imagefile"]["label"] ?? null
+            );
         }
         // additional content editing mode information
         $this->object->setAdditionalContentEditingMode(