diff --git a/functions/gravity-forms-popup-confirmation/function.php b/functions/gravity-forms-popup-confirmation/function.php
index 0a3aa36..597d0d1 100644
--- a/functions/gravity-forms-popup-confirmation/function.php
+++ b/functions/gravity-forms-popup-confirmation/function.php
@@ -20,6 +20,14 @@
 
     global $this_function;
 
+    // If no classes are set for the form, do nothing.
+
+    if( ! $form['cssClass'] ) {
+
+        return;
+
+    }
+
     if( strpos( $form['cssClass'], 'gf_confirmation_popup' ) !== false ) {
 
         wp_enqueue_style( $this_function['style'] );
@@ -36,6 +44,14 @@
 
 add_filter('gform_form_args', function( $args ) {
 
+    // If no classes are set for the form, do nothing.
+
+    if( ! $form['cssClass'] ) {
+
+        return $args;
+
+    }    
+
     $form_id = $args['form_id'];
 
     $form = GFAPI::get_form( $form_id );