diff --git a/plugins/exchange_rate.py b/plugins/exchange_rate.py
index 534dadc4f..12b51633a 100644
--- a/plugins/exchange_rate.py
+++ b/plugins/exchange_rate.py
@@ -323,8 +323,9 @@ class Plugin(BasePlugin):
             else:
                 return
 
-        for window in self.gui.windows:
-            window.need_update.set()
+        if self.gui:
+            for window in self.gui.windows:
+                window.need_update.set()
 
     def requires_settings(self):
         return True