fix: missing condition

src/commons.py

@@ -21,8 +21,9 @@ def remove_key_from_dict(d: dict, tbr_key: str) -> None:
     """
     This function removes keys with the value of null from the result.
     """
-    for key in list(d.keys()):
-        if key == tbr_key and d[key] == None:
-            del d[key]
-        else:
-            remove_key_from_dict(d[key], tbr_key)
+    if isinstance(d, dict):
+        for key in list(d.keys()):
+            if key == tbr_key and d[key] == None:
+                del d[key]
+            else:
+                remove_key_from_dict(d[key], tbr_key)