diff --git a/app/presenters/blacklight_range_limit/filter_field.rb b/app/presenters/blacklight_range_limit/filter_field.rb
index 48f7c42..bf1e36a 100644
--- a/app/presenters/blacklight_range_limit/filter_field.rb
+++ b/app/presenters/blacklight_range_limit/filter_field.rb
@@ -50,7 +50,12 @@ def remove(item)
     def values(except: [])
       params = search_state.params
       param_key = filters_key
-      range = if params.dig(param_key, config.key).is_a? Range
+      range = if !params.try(:dig, param_key).respond_to?(:dig)
+        # bad data, not a hash at all, correct it, only necessary in BL
+        # prior to 8.x, not sure why.
+        params.delete(param_key)
+        nil
+      elsif params.dig(param_key, config.key).is_a? Range
         params.dig(param_key, config.key)
       elsif params.dig(param_key, config.key).is_a? Hash
         b_bound = params.dig(param_key, config.key, :begin).presence