diff --git a/lib/include/srsran/asn1/asn1_utils.h b/lib/include/srsran/asn1/asn1_utils.h
index 87696d7b6..f1dcfcd74 100644
--- a/lib/include/srsran/asn1/asn1_utils.h
+++ b/lib/include/srsran/asn1/asn1_utils.h
@@ -193,8 +193,12 @@ public:
   {
     size_ = nof_items;
     cap_  = nof_items;
-    data_ = new T[cap_];
-    std::copy(ptr, ptr + size_, data_);
+    if (ptr != NULL) {
+      data_ = new T[cap_];
+      std::copy(ptr, ptr + size_, data_);
+    } else {
+      data_ = NULL;
+    }
   }
   ~dyn_array()
   {