diff --git a/stepmania/src/archutils/Darwin/HIDDevice.h b/stepmania/src/archutils/Darwin/HIDDevice.h
index 438c72ffc8..f943968b89 100644
--- a/stepmania/src/archutils/Darwin/HIDDevice.h
+++ b/stepmania/src/archutils/Darwin/HIDDevice.h
@@ -30,7 +30,7 @@ inline void PrintIOErr( IOReturn err, const char *s )
 
 inline Boolean IntValue( CFTypeRef o, int &n )
 {
-	if( CFGetTypeID(o) != CFNumberGetTypeID() )
+	if( !o || CFGetTypeID(o) != CFNumberGetTypeID() )
 		return false;
 	return CFNumberGetValue( CFNumberRef(o), kCFNumberIntType, &n );
 }