diff --git a/src/main/java/edu/harvard/iq/dataverse/DatasetServiceBean.java b/src/main/java/edu/harvard/iq/dataverse/DatasetServiceBean.java
index 706fa5ade01..226579e6143 100644
--- a/src/main/java/edu/harvard/iq/dataverse/DatasetServiceBean.java
+++ b/src/main/java/edu/harvard/iq/dataverse/DatasetServiceBean.java
@@ -883,7 +883,10 @@ public long findStorageSize(Dataset dataset, boolean countCachedExtras) throws I
             if (!countCachedExtras) {
                 if (datafile.isTabularData()) {
                     // count the size of the stored original, in addition to the main tab-delimited file:
-                    total += datafile.getDataTable().getOriginalFileSize(); 
+                    Long originalFileSize = datafile.getDataTable().getOriginalFileSize();
+                    if (originalFileSize != null) { 
+                        total += originalFileSize;
+                    }
                 }
             } else {
                 StorageIO<DataFile> storageIO = datafile.getStorageIO();