diff --git a/src/Output/QROutputAbstract.php b/src/Output/QROutputAbstract.php
index ce474554d..6dab31659 100644
--- a/src/Output/QROutputAbstract.php
+++ b/src/Output/QROutputAbstract.php
@@ -77,7 +77,7 @@ abstract class QROutputAbstract implements QROutputInterface{
 
 		$class = get_called_class();
 
-		if(\array_key_exists($class, QRCode::OUTPUT_MODES) && \in_array($this->options->outputType, QRCode::OUTPUT_MODES[$class])){
+		if(isset(QRCode::OUTPUT_MODES[$class]) && in_array($this->options->outputType, QRCode::OUTPUT_MODES[$class])){
 			$this->outputMode = $this->options->outputType;
 		}