diff --git a/source/opt/generate_webgpu_initializers_pass.cpp b/source/opt/generate_webgpu_initializers_pass.cpp
index 9334b43ee..6438b21ae 100644
--- a/source/opt/generate_webgpu_initializers_pass.cpp
+++ b/source/opt/generate_webgpu_initializers_pass.cpp
@@ -59,6 +59,8 @@ Pass::Status GenerateWebGPUInitializersPass::Process() {
     changed = true;
 
     auto* constant_inst = GetNullConstantForVariable(inst);
+    if (!constant_inst) return Status::Failure;
+
     if (seen_null_constants_.find(constant_inst) ==
         seen_null_constants_.end()) {
       constant_inst->InsertBefore(inst);