diff --git a/src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs b/src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs
index bea94805a0..4e1cb7b221 100644
--- a/src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs
+++ b/src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs
@@ -1244,7 +1244,7 @@ namespace BizHawk.Client.EmuHawk
 						return 0;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
-					if (match is null) return;
+					if (match is null) return default;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -1278,7 +1278,7 @@ namespace BizHawk.Client.EmuHawk
 						return 0;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
-					if (match is null) return;
+					if (match is null) return default;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);