diff --git a/ag/ag_popupchat.php b/ag/ag_popupchat.php
index 84285c3..ec05226 100644
--- a/ag/ag_popupchat.php
+++ b/ag/ag_popupchat.php
@@ -203,4 +203,4 @@ if (isset($_GET['send'])) {
 <?php
 
 	}
-?>
\ No newline at end of file
+?>
diff --git a/ag/include/parse.inc.php b/ag/include/parse.inc.php
index dbe9568..a2e6cb0 100644
--- a/ag/include/parse.inc.php
+++ b/ag/include/parse.inc.php
@@ -303,6 +303,9 @@ function validateStringArray($value){
 }
 
 function validateStringCritical($value) {
+	if($value == null) {
+		return null;
+	}
 	$value = validateString($value);
 	return preg_replace('#[()\]\[\s]#', '', $value);
 }