diff --git a/src/murfey/server/api/__init__.py b/src/murfey/server/api/__init__.py
index fa85608e2..e855e018f 100644
--- a/src/murfey/server/api/__init__.py
+++ b/src/murfey/server/api/__init__.py
@@ -1262,7 +1262,7 @@ async def request_tomography_preprocessing(
 
         processing_job_parameters = db.exec(
             select(TomographyProcessingParameters).where(
-                TomographyProcessingParameters.pj_id == data_collection[2].id
+                TomographyProcessingParameters.pj_id == data_collection[0][2].id
             )
         ).all()
         if processing_job_parameters: