diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index 043e9747504..e2caf4ca3d9 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -16,7 +16,7 @@ jobs:
           - name: Set up php
             uses: shivammathur/setup-php@master
             with:
-                php-version: {{ matrix.php-version }}
+                php-version: ${{ matrix.php-version }}
                 tools: composer:v1
                 coverage: none
           - name: Install dependencies
diff --git a/lib/Controller/ImageController.php b/lib/Controller/ImageController.php
index 108a86a1033..4ccd5b3139c 100644
--- a/lib/Controller/ImageController.php
+++ b/lib/Controller/ImageController.php
@@ -150,7 +150,7 @@ public function uploadImage(int $documentId, int $sessionId, string $sessionToke
 					$userId = $this->getUserIdFromSession($documentId, $sessionId, $sessionToken);
 					$uploadResult = $this->imageService->uploadImage($documentId, $newFileName, $newFileResource, $userId);
 				}
-				if (isset($insertResult['error'])) {
+				if (isset($uploadResult['error'])) {
 					return new DataResponse($uploadResult, Http::STATUS_BAD_REQUEST);
 				} else {
 					return new DataResponse($uploadResult);
@@ -220,7 +220,7 @@ public function getImage(int $documentId, int $sessionId, string $sessionToken,
 			return $imageFile !== null
 				? new DataDownloadResponse(
 					$imageFile->getContent(),
-					Http::STATUS_OK,
+					(string) Http::STATUS_OK,
 					$this->getSecureMimeType($imageFile->getMimeType())
 				)
 				: new DataResponse('', Http::STATUS_NOT_FOUND);