diff --git a/ggml-vulkan.cpp b/ggml-vulkan.cpp
index 6ae1a8fc3..a0a2a9b0e 100644
--- a/ggml-vulkan.cpp
+++ b/ggml-vulkan.cpp
@@ -307,7 +307,9 @@ bool ggml_vk_has_h2d_all(struct ggml_kompute_context * ctx) {
 void ggml_vk_free(struct ggml_kompute_context * ctx) {
     assert(ctx == s_kompute_context);
     s_kompute_context = nullptr;
-    delete ctx;
+    if (ctx != nullptr) {
+        delete ctx;
+    }
 }
 
 static
diff --git a/kompute/op_add.comp b/kompute/op_add.comp
index 019a68449..f242864dd 100644
--- a/kompute/op_add.comp
+++ b/kompute/op_add.comp
@@ -20,7 +20,6 @@ layout(push_constant) uniform PushConstants {
     uint inAOff;
     uint inBOff;
     uint outOff;
-    uint row;
 } pcs;
 
 void main() {