diff --git a/scripts/keyd-application-mapper b/scripts/keyd-application-mapper
index 3310728..9dd2a04 100755
--- a/scripts/keyd-application-mapper
+++ b/scripts/keyd-application-mapper
@@ -112,8 +112,11 @@ class SwayMonitor():
                     cls = props['class']
                     title = props['title']
             except:
-                title = ''
-                cls = data['container']['app_id']
+                try:
+                    title = ''
+                    cls = data['container']['app_id']
+                except:
+                    pass
 
             if title == '' and cls == '':
                 continue