diff --git a/include/nlohmann/detail/conversions/to_json.hpp b/include/nlohmann/detail/conversions/to_json.hpp
index db9eaf2bd2..83ad66d7e5 100644
--- a/include/nlohmann/detail/conversions/to_json.hpp
+++ b/include/nlohmann/detail/conversions/to_json.hpp
@@ -153,8 +153,11 @@ struct external_constructor<value_t::array>
     {
         j.m_type = value_t::array;
         j.m_value = value_t::array;
-        j.m_value.array->resize(arr.size());
-        std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
+        if (arr.size() > 0)
+        {
+            j.m_value.array->resize(arr.size());
+            std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
+        }
         j.assert_invariant();
     }
 };
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index ec5f70318b..52acaf40ed 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -3488,8 +3488,11 @@ struct external_constructor<value_t::array>
     {
         j.m_type = value_t::array;
         j.m_value = value_t::array;
-        j.m_value.array->resize(arr.size());
-        std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
+        if (arr.size() > 0)
+        {
+            j.m_value.array->resize(arr.size());
+            std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
+        }
         j.assert_invariant();
     }
 };