diff --git a/.github/workflows/cluster-faces-test.yml b/.github/workflows/cluster-faces-test.yml
index a8bebcf9d..fed18b839 100644
--- a/.github/workflows/cluster-faces-test.yml
+++ b/.github/workflows/cluster-faces-test.yml
@@ -140,21 +140,21 @@ jobs:
         id: photos-cache
         with:
           path: data/admin/files/
-          key: https://cloud.nextcloud.com/s/4JqQdPy3dicQRPr/download/IMDb-Face.zip
+          key: https://cloud.nextcloud.com/public.php/dav/files/wfDk23DBsXYrd4S/IMDb-Face.zip
 
       - name: Upload photos
         if: steps.photos-cache.outputs.cache-hit != 'true'
         run: |
           mkdir -p data/admin/files/
           cd data/admin/files
-          wget https://cloud.nextcloud.com/s/4JqQdPy3dicQRPr/download/IMDb-Face.zip
+          wget https://cloud.nextcloud.com/public.php/dav/files/wfDk23DBsXYrd4S/IMDb-Face.zip
           unzip IMDb-Face.zip
           rm IMDb-Face.zip
 
       - uses: actions/cache/save@v3
         with:
           path: data/admin/files/
-          key: https://cloud.nextcloud.com/s/4JqQdPy3dicQRPr/download/IMDb-Face.zip
+          key: https://cloud.nextcloud.com/public.php/dav/files/wfDk23DBsXYrd4S/IMDb-Face.zip
 
       - name: Set config
         run: |
@@ -259,7 +259,7 @@ jobs:
       - name: Download IMDb-Face.csv
         working-directory: apps/${{ env.APP_NAME }}/tests/res
         run: |
-          wget https://cloud.nextcloud.com/s/4JqQdPy3dicQRPr/download/IMDb-Face-csv.zip 
+          wget https://cloud.nextcloud.com/public.php/dav/files/wfDk23DBsXYrd4S/IMDb-Face-csv.zip 
           unzip IMDb-Face-csv.zip
           rm IMDb-Face-csv.zip
 
diff --git a/composer.json b/composer.json
index 079e82898..1a3649f1c 100644
--- a/composer.json
+++ b/composer.json
@@ -4,6 +4,7 @@
         "ext-json": "*",
         "ext-pdo": "*",
         "rubix/ml": "2.x",
+        "amphp\/parallel": "1.4.x",
         "bamarni/composer-bin-plugin": "^1.8"
     },
     "autoload": {
diff --git a/lib/Classifiers/Classifier.php b/lib/Classifiers/Classifier.php
index 823bd61c7..f34dccaab 100644
--- a/lib/Classifiers/Classifier.php
+++ b/lib/Classifiers/Classifier.php
@@ -323,6 +323,10 @@ public function generatePreviewWithProvider(File $file): string {
 		// Create a temporary file *with the correct extension*
 		$tmpname = $this->tempManager->getTemporaryFile('.jpg');
 
+		if ($tmpname === false) {
+			throw new \OCA\Recognize\Exception\Exception('Could not create tmpfile');
+		}
+
 		$tmpfile = fopen($tmpname, 'wb');
 
 		if ($tmpfile === false) {
@@ -385,6 +389,10 @@ public function generatePreviewWithGD(string $path): string {
 		// Create a temporary file *with the correct extension*
 		$tmpname = $this->tempManager->getTemporaryFile('.jpg');
 
+		if ($tmpname === false) {
+			throw new \OCA\Recognize\Exception\Exception('Could not create tmpfile');
+		}
+
 		$use_gd_quality = (int)\OCP\Server::get(IConfig::class)->getSystemValue('recognize.preview.quality', '100');
 		if (imagejpeg($previewImage, $tmpname, $use_gd_quality) === false) {
 			imagedestroy($image);