diff --git a/src/MaterialManager.py b/src/MaterialManager.py
index bdfbaa2..a37b26d 100644
--- a/src/MaterialManager.py
+++ b/src/MaterialManager.py
@@ -25,4 +25,11 @@ def changeMaterial(self, material) -> bool:
         return self._announceMaterial(returnText)
 
     def _announceMaterial(self, text: str) -> bool:
-        return self.announcer(text)
+   returnValue = False
+   try:
+       returnValue = self.announcer(text)
+   except:
+       print("Announcement of material type is failed.")
+       returnValue = False
+   finally:
+       return returnValue