diff --git a/src/script/api/script_company.cpp b/src/script/api/script_company.cpp
--- a/src/script/api/script_company.cpp
+++ b/src/script/api/script_company.cpp
@@ -66,6 +66,7 @@
 	EnforcePrecondition(false, name != NULL);
 	const char *text = name->GetEncodedText();
 	EnforcePreconditionEncodedText(false, text);
+	EnforcePreconditionCustomError(false, ::Utf8StringLength(text) < MAX_LENGTH_PRESIDENT_NAME_CHARS, ScriptError::ERR_PRECONDITION_STRING_TOO_LONG);
 
 	return ScriptObject::DoCommand(0, 0, 0, CMD_RENAME_PRESIDENT, text);
 }
diff --git a/src/script/api/script_town.cpp b/src/script/api/script_town.cpp
--- a/src/script/api/script_town.cpp
+++ b/src/script/api/script_town.cpp
@@ -46,6 +46,7 @@
 	const char *encoded_text = text->GetEncodedText();
 	EnforcePreconditionEncodedText(false, encoded_text);
 	EnforcePrecondition(false, IsValidTown(town_id));
+	EnforcePreconditionCustomError(false, ::Utf8StringLength(encoded_text) < MAX_LENGTH_TOWN_NAME_CHARS, ScriptError::ERR_PRECONDITION_STRING_TOO_LONG);
 
 	return ScriptObject::DoCommand(::Town::Get(town_id)->xy, town_id, 0, CMD_TOWN_SET_TEXT, encoded_text);
 }