diff --git a/rpcs3/Emu/Cell/Modules/cellGame.cpp b/rpcs3/Emu/Cell/Modules/cellGame.cpp
index 1f98fa4a35..c278afa8b5 100644
--- a/rpcs3/Emu/Cell/Modules/cellGame.cpp
+++ b/rpcs3/Emu/Cell/Modules/cellGame.cpp
@@ -659,6 +659,11 @@ error_code cellGameGetParamString(s32 id, vm::ptr<char> buf, u32 bufsize)
 {
 	cellGame.warning("cellGameGetParamString(id=%d, buf=*0x%x, bufsize=%d)", id, buf, bufsize);
 
+	if (!buf || bufsize == 0)
+	{
+		return CELL_GAME_ERROR_PARAM;
+	}
+
 	const auto prm = fxm::get<content_permission>();
 
 	if (!prm)
@@ -685,6 +690,11 @@ error_code cellGameSetParamString(s32 id, vm::cptr<char> buf)
 {
 	cellGame.warning("cellGameSetParamString(id=%d, buf=*0x%x)", id, buf);
 
+	if (!buf)
+	{
+		return CELL_GAME_ERROR_PARAM;
+	}
+
 	const auto prm = fxm::get<content_permission>();
 
 	if (!prm)