diff --git a/gldcore/geodata/docs/Geodata.ipynb b/gldcore/geodata/docs/Geodata.ipynb
index 94e0b7eca..4cc00ff0e 100644
--- a/gldcore/geodata/docs/Geodata.ipynb
+++ b/gldcore/geodata/docs/Geodata.ipynb
@@ -2026,7 +2026,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 62,
+   "execution_count": 5,
    "id": "f6cc13cb",
    "metadata": {
     "scrolled": false
@@ -2036,7 +2036,22 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "ERROR [geodata/powerline]: 'height'\r\n"
+      "WARNING [geodata/powerline]: cannot run function CONTACT and 'height' is missing or invalid\n",
+      "          linesag\n",
+      "position         \n",
+      "0            18.0\n",
+      "50           12.2\n",
+      "100           9.4\n",
+      "150           9.7\n",
+      "200          13.0\n",
+      "...           ...\n",
+      "8390        -16.6\n",
+      "8440         -8.9\n",
+      "8490          0.6\n",
+      "8540         12.0\n",
+      "8583         23.0\n",
+      "\n",
+      "[191 rows x 1 columns]\n"
      ]
     }
    ],
diff --git a/gldcore/geodata/geodata_powerline.py b/gldcore/geodata/geodata_powerline.py
index 1e381b2f7..06b66119a 100644
--- a/gldcore/geodata/geodata_powerline.py
+++ b/gldcore/geodata/geodata_powerline.py
@@ -567,11 +567,22 @@ def apply(data, options=default_options, config=default_config, warning=print):
     CONFIG = config
 
     result = pandas.DataFrame(data)
-    result["linesag"] = linesag(data)
-    result["linesway"] = linesway(data)
-    result["linegallop"] = linegallop(data)
-    result["contact"] = contact(result)
-
+    try:
+        result["linesag"] = linesag(data)
+    except Exception as err:
+        WARNING(f"cannot run function LINESAG and {err} is missing or invalid")
+    try:
+        result["linesway"] = linesway(data)
+    except Exception as err:
+        WARNING(f"cannot run function LINEWAY and {err} is missing or invalid")
+    try:
+        result["linegallop"] = linegallop(data)
+    except Exception as err:
+        WARNING(f"cannot run function LINEGALLOP and {err} is missing or invalid")
+    try:
+        result["contact"] = contact(result)
+    except Exception as err:
+        WARNING(f"cannot run function CONTACT and {err} is missing or invalid")
     return result
 
 # perform validation tests