diff --git a/scripts/pdf_unlock.py b/scripts/pdf_unlock.py
index 472a51c..707716d 100644
--- a/scripts/pdf_unlock.py
+++ b/scripts/pdf_unlock.py
@@ -116,7 +116,11 @@ def pdf_unlock(pdf_file, overwrite=False):
         return
 
     # Skip file if it is not encrypted
-    if not isencrypted(pdf_file):
+    try:
+        if not isencrypted(pdf_file):
+            return
+    # SKip file if pdf info cannot be read
+    except AttributeError:
         return
 
     # Get name of Ghostscript executable