diff --git a/lib/galaxy/managers/workflows.py b/lib/galaxy/managers/workflows.py
index 4d84e834cd85..1f1467d5b330 100644
--- a/lib/galaxy/managers/workflows.py
+++ b/lib/galaxy/managers/workflows.py
@@ -1057,7 +1057,15 @@ def do_inputs(inputs, values, prefix, step, other_values=None):
                     except KeyError:
                         continue
                 else:
-                    row_for_param(input_dict, input, values[input.name], other_values, prefix, step)
+                    row_for_param(
+                        input_dict,
+                        input,
+                        # Use values.get so that unspecified param values don't blow up the display
+                        values.get(input.name),
+                        other_values,
+                        prefix,
+                        step,
+                    )
                 input_dicts.append(input_dict)
             return input_dicts