diff --git a/src/opengnsys/modules/server/OpenGnSys/__init__.py b/src/opengnsys/modules/server/OpenGnSys/__init__.py
index 438d50a..5253f3f 100644
--- a/src/opengnsys/modules/server/OpenGnSys/__init__.py
+++ b/src/opengnsys/modules/server/OpenGnSys/__init__.py
@@ -358,7 +358,14 @@ class OpenGnSysWorker(ServerWorker):
         """
         logger.debug('Processing script request')
         # Decoding script
-        script = urllib.parse.unquote(base64.b64decode(post_params.get('script')).decode('utf-8'))
+        param_script = post_params.get('script')
+        if not param_script:
+            return {'op': 'error', 'err': 'Required parameter "script" is missing or empty'}
+        try:
+            b64decoded = base64.b64decode (param_script)
+        except Exception as e:
+            return {'op': 'error', 'err': f'Failed to decode base64: {e}'}
+        script = urllib.parse.unquote (b64decoded.decode ('utf-8'))
         logger.debug('received script "{}"'.format(script))
 
         if post_params.get('client', 'false') == 'false':