diff --git a/emmet-core/emmet/core/vasp/material.py b/emmet-core/emmet/core/vasp/material.py
index 68313f0bf9..d3b5fcc2f6 100644
--- a/emmet-core/emmet/core/vasp/material.py
+++ b/emmet-core/emmet/core/vasp/material.py
@@ -90,6 +90,10 @@ def from_tasks(
             else structure_optimizations
         )
 
+        validity_check = [doc for doc in structure_calcs if doc.is_valid]
+        if not validity_check:
+            raise ValueError("Group must contain at least one valid task")
+
         # Material ID
         possible_mat_ids = [task.task_id for task in structure_optimizations]