diff --git a/src/SysYFIRBuilder/IRBuilder.cpp b/src/SysYFIRBuilder/IRBuilder.cpp
index 38f23d2..106570b 100644
--- a/src/SysYFIRBuilder/IRBuilder.cpp
+++ b/src/SysYFIRBuilder/IRBuilder.cpp
@@ -595,10 +595,21 @@ void IRBuilder::visit(SyntaxTree::VarDef &node) {
                 identAlloca = dynamic_pointer_cast<Value>(tmpIdent);
                 scope.push(node.name, identAlloca);
                 auto varInit = constArrayInit.get();
+                std::cout << arraySize <<  std::endl;
+                Ptr<Constant> tmpZero;
+                if (varType->is_integer_type()) {
+                    tmpZero = CONST_INT(0);
+                } else {
+                    tmpZero = CONST_FLOAT(0.0);
+                }
                 for (int i = 0u; i < arraySize; i++) {
                     auto index = CONST_INT(i);
                     auto ptr = builder->create_gep(identAlloca, {CONST_INT(0), index});
-                    builder->create_store((*varInit)[i], ptr);
+                    if ((*varInit)[i] == nullptr) {
+                        builder->create_store(tmpZero, ptr);
+                    } else {
+                        builder->create_store((*varInit)[i], ptr);
+                    }
                 }
             }
         }