diff --git a/src/xenia/cpu/x64/x64_emit_control.cc b/src/xenia/cpu/x64/x64_emit_control.cc
index 29f2b898b..90a4341cf 100644
--- a/src/xenia/cpu/x64/x64_emit_control.cc
+++ b/src/xenia/cpu/x64/x64_emit_control.cc
@@ -636,7 +636,7 @@ XEEMITTER(mtspr,        0x7C0003A6, XFX)(X64Emitter& e, X86Compiler& c, InstrDat
   // else
   //   SPR(n) <- (RS)[32:63]
 
-  GpVar& v = e.gpr_value(i.XFX.RT);
+  GpVar v = e.gpr_value(i.XFX.RT);
 
   const uint32_t n = ((i.XFX.spr & 0x1F) << 5) | ((i.XFX.spr >> 5) & 0x1F);
   switch (n) {
diff --git a/src/xenia/kernel/modules/xboxkrnl/xboxkrnl_memory.cc b/src/xenia/kernel/modules/xboxkrnl/xboxkrnl_memory.cc
index 468152e84..f26250cab 100644
--- a/src/xenia/kernel/modules/xboxkrnl/xboxkrnl_memory.cc
+++ b/src/xenia/kernel/modules/xboxkrnl/xboxkrnl_memory.cc
@@ -121,6 +121,11 @@ SHIM_CALL NtFreeVirtualMemory_shim(
       region_size_ptr, region_size_value,
       free_type, unknown);
 
+  if (!base_addr_value) {
+    SHIM_SET_RETURN(X_STATUS_MEMORY_NOT_ALLOCATED);
+    return;
+  }
+
   // Free.
   uint32_t flags = 0;
   uint32_t freed_size = xe_memory_heap_free(state->memory(), base_addr_value,
diff --git a/src/xenia/kernel/xbox.h b/src/xenia/kernel/xbox.h
index 66d807f40..9cf21c425 100644
--- a/src/xenia/kernel/xbox.h
+++ b/src/xenia/kernel/xbox.h
@@ -41,6 +41,7 @@ typedef uint32_t X_STATUS;
 #define X_STATUS_BUFFER_TOO_SMALL                       ((uint32_t)0xC0000023L)
 #define X_STATUS_OBJECT_TYPE_MISMATCH                   ((uint32_t)0xC0000024L)
 #define X_STATUS_INVALID_PAGE_PROTECTION                ((uint32_t)0xC0000045L)
+#define X_STATUS_MEMORY_NOT_ALLOCATED                   ((uint32_t)0xC00000A0L)
 
 
 // MEM_*, used by NtAllocateVirtualMemory