diff --git a/CHANGELOG.md b/CHANGELOG.md
index e1060b6..f6a3140 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,14 +1,25 @@
 # Changelog
 
+## 1.4.5 (2023-07-25)
+
+* Make sure that `RailsOps::Exceptions::SubOpValidationFailed` always results in
+  an Error 500 when handled by a Rails controller.
+
+  Internal reference: `#114719`.
+
 ## 1.4.5 (2023-07-10)
 
 * Fix bug introduced in previous release 1.4.4.
 
+  Internal reference: `#114719`.
+
 ## 1.4.4 (2023-07-10)
 
 * Adapt method `sub_op` to catch `<op-class>.validation_errors` and re-throw
   them as `RailsOps::Exceptions::SubOpValidationFailed`.
 
+  Internal reference: `#114719`.
+
 ## 1.4.3 (2023-03-27)
 
 * Extend the `operation` generator to accept additional flags to skip the
diff --git a/lib/rails_ops/controller_mixin.rb b/lib/rails_ops/controller_mixin.rb
index 5f4b873..2057d2e 100644
--- a/lib/rails_ops/controller_mixin.rb
+++ b/lib/rails_ops/controller_mixin.rb
@@ -47,6 +47,17 @@ module ControllerMixin
           fail ActionController::BadRequest
         end
       end
+
+      # #114719: If 'rescue_validation_error_in_controller' is enabled, the
+      # exception 'SubOpValidationFailed' may have
+      # 'Schemacop::Exceptions::ValidationError' as a 'cause', which in turn
+      # causes ActiveSupport's 'Rescuable' to look for a rescue_from with the
+      # exception's 'cause', which would then result in a BadRequest. For this
+      # case, we add a separate rescue_from here so that 'SubOpValidationFailed'
+      # always results in an error 500 as it must be a programming error.
+      rescue_from RailsOps::Exceptions::SubOpValidationFailed do |e|
+        fail e
+      end
     end
 
     # Instantiates and returns a new operation with the given class. If no class