diff --git a/scripts/nb-tester/qiskit_docs_notebook_tester/execute.py b/scripts/nb-tester/qiskit_docs_notebook_tester/execute.py
index 54ddac4c63..c0d91948eb 100644
--- a/scripts/nb-tester/qiskit_docs_notebook_tester/execute.py
+++ b/scripts/nb-tester/qiskit_docs_notebook_tester/execute.py
@@ -75,15 +75,22 @@ async def execute_notebook(job: NotebookJob) -> Result:
         print(f"▶️ Executing {job.path}")
 
     working_directory = tempfile.TemporaryDirectory()
-    possible_exceptions = (
+    execution_exceptions = (
         nbclient.exceptions.CellExecutionError,
         nbclient.exceptions.CellTimeoutError,
     )
     try:
         nb = await _execute_notebook(job, working_directory.name)
-    except possible_exceptions as err:
+    except execution_exceptions as err:
         print(f"❌ Problem in {job.path}:\n{err}")
         return Result(False, reason="Exception in notebook")
+    except SyntaxError as err:
+        print(
+            f"❌ Problem in {job.path}:\n"
+            f"Error parsing code while post-processing (line {err.lineno}):\n"
+            f"  {err.text}"
+        )
+        return Result(False, reason="Invalid syntax")
     finally:
         working_directory.cleanup()
 
diff --git a/scripts/nb-tester/qiskit_docs_notebook_tester/post_process.py b/scripts/nb-tester/qiskit_docs_notebook_tester/post_process.py
index 8bcc0f3464..06d33a5b0c 100644
--- a/scripts/nb-tester/qiskit_docs_notebook_tester/post_process.py
+++ b/scripts/nb-tester/qiskit_docs_notebook_tester/post_process.py
@@ -11,12 +11,13 @@
 # been altered from the originals.
 
 import ast
-import re
-import sys
 import importlib
 import itertools
+import re
+import sys
 from pathlib import Path
-from typing_extensions import Iterable
+from collections.abc import Iterable
+
 import nbformat
 from squeaky import clean_notebook
 
@@ -56,11 +57,11 @@ def get_package_versions(python_code: str, requirements_txt: str) -> str:
     # things installed by both 'qiskit' and 'qiskit[visualization]'. For simplicity,
     # we include any packages that could be relevant.
     module_to_packages = importlib.metadata.packages_distributions()
-    packages = flatten_to_list([
+    packages = flatten(
       module_to_packages[module]
       for module in get_used_modules(python_code)
       if module not in sys.stdlib_module_names
-    ])
+    )
     package_versions = "\n".join(
         line for line in requirements_txt.split("\n")
         if re.split('[\\[~=]', line)[0].strip() in packages
@@ -69,10 +70,10 @@ def get_package_versions(python_code: str, requirements_txt: str) -> str:
 
 def get_used_modules(source: str) -> Iterable[str]:
     # Remove Jupyter magics
-    source = "\n".join([
+    source = "\n".join(
         line for line in source.split("\n")
         if not line.strip().startswith("%")
-    ])
+   )
     for node in ast.iter_child_nodes(ast.parse(source=source, filename="_.py")):
         if isinstance(node, ast.Import):
             for module in node.names:
@@ -81,5 +82,5 @@ def get_used_modules(source: str) -> Iterable[str]:
             if node.module is not None:
                 yield node.module.split(".")[0]
 
-def flatten_to_list(i: Iterable[Iterable]) -> list:
+def flatten(i: Iterable[Iterable]) -> list:
     return list(itertools.chain.from_iterable(i))