diff --git a/Core/HLE/sceKernelInterrupt.cpp b/Core/HLE/sceKernelInterrupt.cpp
index 1242eef768..c7dcc9a8ae 100644
--- a/Core/HLE/sceKernelInterrupt.cpp
+++ b/Core/HLE/sceKernelInterrupt.cpp
@@ -431,6 +431,8 @@ SubIntrHandler *__RegisterSubIntrHandler(u32 intrNumber, u32 subIntrNumber, u32
 
 int __ReleaseSubIntrHandler(int intrNumber, int subIntrNumber)
 {
+	if (intrNumber >= PSP_NUMBER_INTERRUPTS)
+		return -1;
 	if (!intrHandlers[intrNumber]->has(subIntrNumber))
 		return -1;