diff --git a/rpcs3/Emu/Cell/PPUModule.cpp b/rpcs3/Emu/Cell/PPUModule.cpp
index 76e895d512..9a76ec76b5 100644
--- a/rpcs3/Emu/Cell/PPUModule.cpp
+++ b/rpcs3/Emu/Cell/PPUModule.cpp
@@ -88,12 +88,26 @@ void ppu_module_manager::register_module(ppu_static_module* module)
 
 ppu_static_function& ppu_module_manager::access_static_function(const char* module, u32 fnid)
 {
-	return access().at(module)->functions[fnid];
+	auto& res = access().at(module)->functions[fnid];
+
+	if (res.name)
+	{
+		fmt::throw_exception("PPU FNID duplication in module %s (%s, 0x%x)", module, res.name, fnid);
+	}
+
+	return res;
 }
 
 ppu_static_variable& ppu_module_manager::access_static_variable(const char* module, u32 vnid)
 {
-	return access().at(module)->variables[vnid];
+	auto& res = access().at(module)->variables[vnid];
+
+	if (res.name)
+	{
+		fmt::throw_exception("PPU VNID duplication in module %s (%s, 0x%x)", module, res.name, vnid);
+	}
+
+	return res;
 }
 
 const ppu_static_module* ppu_module_manager::get_module(const std::string& name)