diff --git a/PDFCore.py b/PDFCore.py
index 3b2fe00..7efaa1c 100644
--- a/PDFCore.py
+++ b/PDFCore.py
@@ -4316,7 +4316,9 @@ def updateObjects(self):
                             del(compressedObjectsDict)
         for id in self.referencedJSObjects:
             if id not in self.containingJS:
-                object = self.objects[id].getObject()
+                object = None
+                if id in self.objects:
+                    object = self.objects[id].getObject()
                 if object == None:
                     errorMessage = 'Object is None'
                     if isForceMode: