diff --git a/libraries/chain/webassembly/action.cpp b/libraries/chain/webassembly/action.cpp
index 307ddafe6b..fa8bc58981 100644
--- a/libraries/chain/webassembly/action.cpp
+++ b/libraries/chain/webassembly/action.cpp
@@ -5,6 +5,7 @@
 namespace eosio { namespace chain { namespace webassembly {
    int32_t interface::read_action_data(legacy_span<char> memory) const {
       auto s = context.get_action().data.size();
+      if( s == 0 ) return s;
       if( memory.size() == 0 ) return s;
 
       auto copy_size = std::min( static_cast<size_t>(memory.size()), s );