diff --git a/lib/galaxy/tools/parameters/__init__.py b/lib/galaxy/tools/parameters/__init__.py
index 81950cbb3e43..1bc0258350d4 100644
--- a/lib/galaxy/tools/parameters/__init__.py
+++ b/lib/galaxy/tools/parameters/__init__.py
@@ -737,6 +737,13 @@ def populate_state_async(
                         incoming[input_name] = [int(v) for v in value]
                     else:
                         incoming[input_name] = value
+                elif input.type == "text":
+                    # see behavior of tools in test_tools.py::test_null_to_text_tools
+                    # these parameters act as empty string in this context
+                    if value is None and not input.optional:
+                        incoming[input_name] = ""
+                    else:
+                        incoming[input_name] = value
                 else:
                     incoming[input_name] = value