diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index 79b259a41..472eb0453 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -3515,13 +3515,14 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 	 * Sends a Form to the player, or queue to send it if a form is already open.
 	 */
 	public function sendForm(Form $form) : void{
+		$formData = json_encode($form);
+		if($formData === false){
+			throw new \InvalidArgumentException("Failed to encode form JSON: " . json_last_error_msg());
+		}
 		$id = $this->formIdCounter++;
 		$pk = new ModalFormRequestPacket();
 		$pk->formId = $id;
-		$pk->formData = json_encode($form);
-		if($pk->formData === false){
-			throw new \InvalidArgumentException("Failed to encode form JSON: " . json_last_error_msg());
-		}
+		$pk->formData = $formData;
 		if($this->dataPacket($pk)){
 			$this->forms[$id] = $form;
 		}
diff --git a/tests/phpstan/configs/l7-baseline.neon b/tests/phpstan/configs/l7-baseline.neon
index eb84dc9a9..7409fb871 100644
--- a/tests/phpstan/configs/l7-baseline.neon
+++ b/tests/phpstan/configs/l7-baseline.neon
@@ -45,11 +45,6 @@ parameters:
 			count: 1
 			path: ../../../src/pocketmine/Player.php
 
-		-
-			message: "#^Property pocketmine\\\\network\\\\mcpe\\\\protocol\\\\ModalFormRequestPacket\\:\\:\\$formData \\(string\\) does not accept string\\|false\\.$#"
-			count: 1
-			path: ../../../src/pocketmine/Player.php
-
 		-
 			message: "#^Only booleans are allowed in an if condition, bool\\|int given\\.$#"
 			count: 1