diff --git a/owa_base.php b/owa_base.php
index eb2f874e9..3255354e4 100644
--- a/owa_base.php
+++ b/owa_base.php
@@ -99,14 +99,16 @@ function getMsg($code, $substitutions = []) {
         if ( $code && array_key_exists( $code, $_owa_messages ) ) {
 
             $msg = $_owa_messages[$code];
-
-            if (isset($msg['headline'])) {
-                $msg['headline'] = vsprintf($msg['headline'], $substitutions['headline']);
-            }
-
-            if (isset($msg['message'])) {
-                $msg['message'] = vsprintf($msg['message'], $substitutions['message']);
-            }
+			
+			if ( $substitutions ) {
+	            if (isset($msg['headline'])) {
+	                $msg['headline'] = vsprintf($msg['headline'], $substitutions['headline']);
+	            }
+	
+	            if (isset($msg['message'])) {
+	                $msg['message'] = vsprintf($msg['message'], $substitutions['message']);
+	            }
+	        }
         }
 
         return $msg;