diff --git a/src/OpenGL/compiler/OutputASM.cpp b/src/OpenGL/compiler/OutputASM.cpp
index a0b5500..da87532 100644
--- a/src/OpenGL/compiler/OutputASM.cpp
+++ b/src/OpenGL/compiler/OutputASM.cpp
@@ -3521,7 +3521,7 @@
 				{
 					TIntermBinary *assign = variable->getAsBinaryNode();
 
-					if(assign->getOp() == EOpInitialize)
+					if(assign && assign->getOp() == EOpInitialize)
 					{
 						TIntermSymbol *symbol = assign->getLeft()->getAsSymbolNode();
 						TIntermConstantUnion *constant = assign->getRight()->getAsConstantUnion();