diff --git a/pcsx2/x86/iCore.cpp b/pcsx2/x86/iCore.cpp
index 629371ad68..e0bf5001f1 100644
--- a/pcsx2/x86/iCore.cpp
+++ b/pcsx2/x86/iCore.cpp
@@ -236,11 +236,19 @@ int _allocTempXMMreg(XMMSSEType type, int xmmreg)
 	else
 		_freeXMMreg(xmmreg);
 
-	xmmregs[xmmreg].inuse = 1;
-	xmmregs[xmmreg].type = XMMTYPE_TEMP;
-	xmmregs[xmmreg].needed = 1;
-	xmmregs[xmmreg].counter = g_xmmAllocCounter++;
-	g_xmmtypes[xmmreg] = type;
+	if (xmmreg == -1)
+	{
+		pxFailDev("*PCSX2*: XMM Reg Allocation Error in _allocTempXMMreg()!");
+		throw Exception::FailedToAllocateRegister();
+	}
+	else
+	{
+		xmmregs[xmmreg].inuse = 1;
+		xmmregs[xmmreg].type = XMMTYPE_TEMP;
+		xmmregs[xmmreg].needed = 1;
+		xmmregs[xmmreg].counter = g_xmmAllocCounter++;
+		g_xmmtypes[xmmreg] = type;
+	}
 
 	return xmmreg;
 }
@@ -317,13 +325,21 @@ int _allocFPtoXMMreg(int xmmreg, int fpreg, int mode)
 	if (xmmreg == -1)
 		xmmreg = _getFreeXMMreg();
 
-	g_xmmtypes[xmmreg] = XMMT_FPS;
-	xmmregs[xmmreg].inuse = 1;
-	xmmregs[xmmreg].type = XMMTYPE_FPREG;
-	xmmregs[xmmreg].reg = fpreg;
-	xmmregs[xmmreg].mode = mode;
-	xmmregs[xmmreg].needed = 1;
-	xmmregs[xmmreg].counter = g_xmmAllocCounter++;
+	if (xmmreg == -1)
+	{
+		pxFailDev("*PCSX2*: XMM Reg Allocation Error in _allocFPtoXMMreg()!");
+		throw Exception::FailedToAllocateRegister();
+	}
+	else
+	{
+		g_xmmtypes[xmmreg] = XMMT_FPS;
+		xmmregs[xmmreg].inuse = 1;
+		xmmregs[xmmreg].type = XMMTYPE_FPREG;
+		xmmregs[xmmreg].reg = fpreg;
+		xmmregs[xmmreg].mode = mode;
+		xmmregs[xmmreg].needed = 1;
+		xmmregs[xmmreg].counter = g_xmmAllocCounter++;
+	}
 
 	if (mode & MODE_READ)
 		xMOVSSZX(xRegisterSSE(xmmreg), ptr[&fpuRegs.fpr[fpreg].f]);
@@ -438,13 +454,21 @@ int _allocFPACCtoXMMreg(int xmmreg, int mode)
 	if (xmmreg == -1)
 		xmmreg = _getFreeXMMreg();
 
-	g_xmmtypes[xmmreg] = XMMT_FPS;
-	xmmregs[xmmreg].inuse = 1;
-	xmmregs[xmmreg].type = XMMTYPE_FPACC;
-	xmmregs[xmmreg].mode = mode;
-	xmmregs[xmmreg].needed = 1;
-	xmmregs[xmmreg].reg = 0;
-	xmmregs[xmmreg].counter = g_xmmAllocCounter++;
+	if (xmmreg == -1)
+	{
+		pxFailDev("*PCSX2*: XMM Reg Allocation Error in _allocFPACCtoXMMreg()!");
+		throw Exception::FailedToAllocateRegister();
+	}
+	else
+	{
+		g_xmmtypes[xmmreg] = XMMT_FPS;
+		xmmregs[xmmreg].inuse = 1;
+		xmmregs[xmmreg].type = XMMTYPE_FPACC;
+		xmmregs[xmmreg].mode = mode;
+		xmmregs[xmmreg].needed = 1;
+		xmmregs[xmmreg].reg = 0;
+		xmmregs[xmmreg].counter = g_xmmAllocCounter++;
+	}
 
 	if (mode & MODE_READ)
 	{