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-rw-r--r--src/emu/mconfig.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/emu/mconfig.cpp b/src/emu/mconfig.cpp
index 2c8c1aa011b..275a4af46ae 100644
--- a/src/emu/mconfig.cpp
+++ b/src/emu/mconfig.cpp
@@ -404,6 +404,6 @@ void machine_config::set_perfect_quantum(device_t &device, std::string tag)
m_current_device->tag());
}
- m_perfect_quantum_device.first = &device;
+ m_perfect_quantum_device.first = tag.empty() ? nullptr : &device;
m_perfect_quantum_device.second = std::move(tag);
}