diff --git a/src/badger/gui/mini/components/env_cbox.py b/src/badger/gui/mini/components/env_cbox.py
index 29327a0a..8074ba77 100644
--- a/src/badger/gui/mini/components/env_cbox.py
+++ b/src/badger/gui/mini/components/env_cbox.py
@@ -27,6 +27,7 @@
     QLabel,
 )
 from PyQt5.QtCore import QRegExp, pyqtSignal
+import numpy as np
 from badger.gui.components.obs_table import ObservableTable
 from badger.settings import init_settings
 from pydantic_core import ValidationError
@@ -659,6 +660,15 @@ def filter_var(self):
 
         self.var_table.update_variables(_variables, 1)
 
+    def get_nan_vars(self) -> list[str]:
+        """Return keys of var_table entries with NaN values"""
+        current_values = self.var_table.current_values
+        return [
+            key
+            for key, value in current_values.items()
+            if isinstance(value, (float, np.floating)) and np.isnan(value)
+        ]
+
     def toggle_obj_show_mode(self, _):
         self.obj_table.update_show_selected_only(self.check_only_obj.isChecked())
 
diff --git a/src/badger/gui/mini/pages/routine_page.py b/src/badger/gui/mini/pages/routine_page.py
index 4bed3b91..889ae4af 100644
--- a/src/badger/gui/mini/pages/routine_page.py
+++ b/src/badger/gui/mini/pages/routine_page.py
@@ -1184,6 +1184,19 @@ def select_env(self, i: int):
         # Update the docs
         self.window_env_docs.update_docs(env.name, "environment")
 
+        self.check_for_nan_vars()
+
+    def check_for_nan_vars(self) -> None:
+        """Show a warning popup to notify user if any var_table values are NaN"""
+        nan_value_keys = self.env_box.get_nan_vars()
+        if nan_value_keys:
+            nan_vars = "\n".join(f" -  {key}" for key in nan_value_keys)
+            QMessageBox.warning(
+                self,
+                "Variables with invalid values",
+                f"Failed to get values for the following variables:\n{nan_vars}",
+            )
+
     def get_init_table_header(self):
         table = self.env_box.init_table
         header_list = []