diff --git a/herringbone_correction/batch_run_autofilet.py b/herringbone_correction/batch_run_autofilet.py
index 3aad0ec..983f251 100644
--- a/herringbone_correction/batch_run_autofilet.py
+++ b/herringbone_correction/batch_run_autofilet.py
@@ -256,8 +256,8 @@ def build_inventory():
     new_image_flag = True
     indx = 0
     new_run_indices = np.where(np.array(all_lines) == 'NEW RUN STARTS HERE\n')
-    if len(new_run_indices) < 1:
-        new_run_indx == 0
+    if len(new_run_indices[0]) < 1:
+        new_run_indx = 0
     else:
         new_run_indx = new_run_indices[0][-1]