diff --git a/paperless/scripts/removePdfPassword.py b/paperless/scripts/removePdfPassword.py
old mode 100644
new mode 100755
index 4931931..57942e6
--- a/paperless/scripts/removePdfPassword.py
+++ b/paperless/scripts/removePdfPassword.py
@@ -25,6 +25,7 @@ def read_passwords_from_file():
     if not passwords:
         print("Empty password file")
 
+    passwords.append("") # some PDFs are encrypted with empty password
     return passwords
 
 
@@ -58,6 +59,13 @@ if __name__ == "__main__":
 
     doc_path = os.environ.get('DOCUMENT_WORKING_PATH')
 
+    if not doc_path:
+        doc_path = sys.argv[1]
+
+    if not doc_path:
+        print("Neither DOCUMENT_WORKING_PATH set nor document passed by parameter.")
+        sys.exit(1)
+
     if not os.path.exists(doc_path):
         print(f"Document {doc_path} not found.")
         sys.exit(1)