diff --git a/.github/workflows/test_examples.yml b/.github/workflows/test_examples.yml
index 2d8c90ddc..dc37663e2 100644
--- a/.github/workflows/test_examples.yml
+++ b/.github/workflows/test_examples.yml
@@ -48,6 +48,8 @@ jobs:
               f=(${file//// })
               f=${f[1]}
               f=(${f//./})
+              finalFile="$runfolder"/"$f".py
+              echo "convert notebook $file to script $finalFile"
               jupyter nbconvert --to python "$file" --stdout | grep -v -e "^get_ipython" > "$runfolder"/"$f".py
             fi
           done
@@ -57,9 +59,8 @@ jobs:
           runfolder: "notebook_run"
         run: | 
           cd "$runfolder"
-          python3 -c "from sys import path; print(path)"
-          python3 -c "from crpropa import c_light"
-          for file in ./*.py; do 
+          ls
+          for file in *.py; do 
             if [ -f "$file" ]; then
               python3 "$file"
             fi
diff --git a/doc/pages/example_notebooks/basics/failing.ipynb b/doc/pages/example_notebooks/basics/failing.ipynb
new file mode 100644
index 000000000..ecb70d9b8
--- /dev/null
+++ b/doc/pages/example_notebooks/basics/failing.ipynb
@@ -0,0 +1,53 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "RuntimeError",
+     "evalue": "this notebook should not succeed",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mRuntimeError\u001b[0m                              Traceback (most recent call last)",
+      "\u001b[1;32m/home/home1/jdo/CRPropa3/doc/pages/example_notebooks/basics/faining.ipynb Zelle 1\u001b[0m in \u001b[0;36m<cell line: 1>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> <a href='vscode-notebook-cell://ssh-remote%2Bk10/home/home1/jdo/CRPropa3/doc/pages/example_notebooks/basics/faining.ipynb#W0sdnNjb2RlLXJlbW90ZQ%3D%3D?line=0'>1</a>\u001b[0m \u001b[39mraise\u001b[39;00m \u001b[39mRuntimeError\u001b[39;00m(\u001b[39m\"\u001b[39m\u001b[39mthis notebook should not succeed\u001b[39m\u001b[39m\"\u001b[39m)\n",
+      "\u001b[0;31mRuntimeError\u001b[0m: this notebook should not succeed"
+     ]
+    }
+   ],
+   "source": [
+    "raise RuntimeError(\"this notebook should not succeed\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}