diff --git a/python/helpers/pydev/_pydevd_bundle/pydevd_comm.py b/python/helpers/pydev/_pydevd_bundle/pydevd_comm.py
index 94d1f5e118e5..c05ea0422bbd 100644
--- a/python/helpers/pydev/_pydevd_bundle/pydevd_comm.py
+++ b/python/helpers/pydev/_pydevd_bundle/pydevd_comm.py
@@ -742,7 +742,7 @@ class NetCommandFactory:
                 else:
                     my_file = abs_path_real_path_and_base[0]
 
-                if is_real_file(my_file) and not is_jup_cell:
+                if not is_jup_cell and is_real_file(my_file):
                     # if filename is Jupyter cell id
                     my_file = pydevd_file_utils.norm_file_to_client(abs_path_real_path_and_base[0])
 
diff --git a/python/helpers/pydev/pydevd_file_utils.py b/python/helpers/pydev/pydevd_file_utils.py
index 1b3077109477..0e4c3aa153c9 100644
--- a/python/helpers/pydev/pydevd_file_utils.py
+++ b/python/helpers/pydev/pydevd_file_utils.py
@@ -556,7 +556,7 @@ def _is_int(filename):
 
 def is_real_file(filename):
     # Check for Jupyter cells
-    return not _is_int(filename) and not filename.startswith("<ipython-input")
+    return not _is_int(filename) and (isinstance(filename, str) and not filename.startswith("<ipython-input"))
 
 
 def is_jupyter_cell(frame):