diff --git a/core/Controller/TextToImageApiController.php b/core/Controller/TextToImageApiController.php
index d3a05011fb76a..1019114bee997 100644
--- a/core/Controller/TextToImageApiController.php
+++ b/core/Controller/TextToImageApiController.php
@@ -81,6 +81,12 @@ public function schedule(string $input, string $appId, string $identifier = '',
 		if (strlen($input) > 64_000) {
 			return new DataResponse(['message' => $this->l->t('Input text is too long')], Http::STATUS_PRECONDITION_FAILED);
 		}
+		if ($numberOfImages > 12) {
+			return new DataResponse(['message' => $this->l->t('Cannot generate more than 12 images')], Http::STATUS_PRECONDITION_FAILED);
+		}
+		if ($numberOfImages < 1) {
+			return new DataResponse(['message' => $this->l->t('Cannot generate less than 1 image')], Http::STATUS_PRECONDITION_FAILED);
+		}
 		$task = new Task($input, $appId, $numberOfImages, $this->userId, $identifier);
 		try {
 			try {
diff --git a/lib/public/TextToImage/Task.php b/lib/public/TextToImage/Task.php
index 7b94de0fbb3bb..ea1b45ef99c4b 100644
--- a/lib/public/TextToImage/Task.php
+++ b/lib/public/TextToImage/Task.php
@@ -68,6 +68,12 @@ final public function __construct(
 		protected ?string $userId,
 		protected ?string $identifier = '',
 	) {
+		if ($this->numberOfImages > 12) {
+			throw new \ValueError('Cannot generate more than 12 images');
+		}
+		if ($this->numberOfImages < 1) {
+			throw new \ValueError('Cannot generate less than 1 image');
+		}
 	}
 
 	/**