diff --git a/scripts/grt/export.py b/scripts/grt/export.py
index 2b32ba92536..0daf8605bab 100644
--- a/scripts/grt/export.py
+++ b/scripts/grt/export.py
@@ -69,7 +69,7 @@ class Sanitization:
             self.sanitization_config['tool_params'] = {}
 
     def blacklisted_tree(self, path):
-        if path.lstrip('.') in self.sanitization_config['tool_params'][self.tool_id]:
+        if self.tool_id in self.sanitization_config['tool_params'] and path.lstrip('.') in self.sanitization_config['tool_params'][self.tool_id]:
             return True
         return False
 
@@ -79,21 +79,23 @@ class Sanitization:
             return 'null'
         # Thus, all tools below here are not blacklisted at the top level.
 
-        # If it isn't in tool_params, there are no keys being sanitized for
-        # this tool so we can return quickly without parsing.
-        if tool_id not in self.sanitization_config['tool_params']:
-            return value
-
         # If the key is listed precisely (not a sub-tree), we can also return slightly more quickly.
-        if key in self.sanitization_config['tool_params'][tool_id]:
+        if tool_id in self.sanitization_config['tool_params'] and key in self.sanitization_config['tool_params'][tool_id]:
             return 'null'
 
         # If the key isn't a prefix for any of the keys being sanitized, then this is safe.
-        if not any(san_key.startswith(key) for san_key in self.sanitization_config['tool_params'][tool_id]):
+        if tool_id in self.sanitization_config['tool_params'] and not any(san_key.startswith(key) for san_key in self.sanitization_config['tool_params'][tool_id]):
             return value
 
         # Slow path.
-        unsanitized = {key: json.loads(value)}
+        if isinstance(value, str):
+            try:
+                unsanitized = {key: json.loads(value)}
+            except ValueError:
+                unsanitized = {key: value}
+        else:
+            unsanitized = {key: value}
+
         self.tool_id = tool_id
         return json.dumps(self._sanitize_value(unsanitized))
 
@@ -117,7 +119,8 @@ class Sanitization:
             self.filesize_cache[data['id']] = data
             return data
         else:
-            raise Exception("Cannot handle {src} yet".format(data))
+            logging.warning("Cannot handle {src} yet".format(data))
+            return data
 
     def _sanitize_dict(self, unsanitized_dict, path=""):
         # if it is a file dictionary, handle specially.