diff --git a/qiling/os/os.py b/qiling/os/os.py
index 3351039a6..7982fe946 100644
--- a/qiling/os/os.py
+++ b/qiling/os/os.py
@@ -60,9 +60,8 @@ def __init__(self, ql: Qiling, resolvers: Mapping[Any, Resolver] = {}):
             # for the standard streams which usually do not support certain operations,
             # such as fileno(). here we use this to determine how we are going to use
             # the environment standard streams
-            assert sts.stdin != None # IDAPython don't have corresponding fds
             sys.stdin.fileno()
-        except (UnsupportedOperation, AssertionError):
+        except UnsupportedOperation:
             # Qiling is used on an interactive shell or embedded python interpreter.
             # if the internal stream buffer is accessible, we should use it
             self._stdin  = getattr(sys.stdin,  'buffer', sys.stdin)