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-rw-r--r--src/emu/natkeyboard.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/emu/natkeyboard.cpp b/src/emu/natkeyboard.cpp
index 1aa8a78ed75..e1921b7a21d 100644
--- a/src/emu/natkeyboard.cpp
+++ b/src/emu/natkeyboard.cpp
@@ -365,7 +365,9 @@ void natural_keyboard::set_in_use(bool usage)
{
// update active usage
m_in_use = usage;
- machine().options().set_value(OPTION_NATURAL_KEYBOARD, usage, OPTION_PRIORITY_CMDLINE);
+ std::string error;
+ machine().options().set_value(OPTION_NATURAL_KEYBOARD, usage, OPTION_PRIORITY_CMDLINE, error);
+ assert(error.empty());
// lock out (or unlock) all keyboard inputs
for (auto &port : machine().ioport().ports())