diff --git a/CHANGELOG.md b/CHANGELOG.md
index 17892fc9..bb0bb1fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,9 @@ This project bumps the version number for any changes (including documentation u
 
 ## [Unreleased] - i.e. pushed to main branch but not yet tagged as a release
 
+## [5.0.6] - 2024-02-11
+- Return date details responses early if there are errors, to avoid exceptions
+
 ## [5.0.5] - 2024-02-02
 - For `date details` batch mode: add support for ingesting grouped fields at the same level as the structured date group. To find the group level of the structured date group, find the `date_field_group` value in the relevant CSV ingest template. If that field has a `REPEATING FIELD GROUP` value in the template, any other field values with the same `REPEATING FIELD GROUP` value can be ingested together.
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 94017908..222bf3c8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GIT
 PATH
   remote: .
   specs:
-    collectionspace-mapper (5.0.5)
+    collectionspace-mapper (5.0.6)
       activesupport (= 7.0.4.3)
       chronic
       collectionspace-client (~> 0.15.0)
diff --git a/lib/collectionspace/mapper/date_details/data_prepper.rb b/lib/collectionspace/mapper/date_details/data_prepper.rb
index df30d6a8..0b7bc160 100644
--- a/lib/collectionspace/mapper/date_details/data_prepper.rb
+++ b/lib/collectionspace/mapper/date_details/data_prepper.rb
@@ -34,6 +34,10 @@ def prep
           if handler.grouped_handler
             extract_grouped_data
             grouped_prepped = handler.grouped_handler.prep(grouped_data)
+            unless grouped_prepped.errors.empty?
+              grouped_prepped.errors.each { |err| response.add_error(err) }
+              return response
+            end
           end
           split_data
           transform_data
@@ -42,6 +46,8 @@ def prep
           clean_transformed
           readd_id
           combine_data_fields
+          return response unless response.errors.empty?
+
           merge_authority_data(auth_prepped) if authority_data
           merge_grouped_data(grouped_prepped) if grouped_data
           response
@@ -209,9 +215,10 @@ def merge_authority_data(auth_prepped)
         def merge_grouped_data(grouped_prepped)
           path = handler.target_path
 
-          response.combined_data[path].merge!(
-            grouped_prepped.combined_data[path]
-          )
+          response.combined_data[path].tap { |data| binding.pry unless data }
+            .merge!(
+              grouped_prepped.combined_data[path]
+            )
           grouped_prepped.errors.each { |err| response.add_error(err) }
           grouped_prepped.terms.each { |term| response.add_term(term) }
           grouped_prepped.warnings.each do |warning|
diff --git a/lib/collectionspace/mapper/version.rb b/lib/collectionspace/mapper/version.rb
index 92884506..8f24b748 100644
--- a/lib/collectionspace/mapper/version.rb
+++ b/lib/collectionspace/mapper/version.rb
@@ -2,6 +2,6 @@
 
 module CollectionSpace
   module Mapper
-    VERSION = "5.0.5"
+    VERSION = "5.0.6"
   end
 end