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lua_newtable causing heap corruption?

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I'm trying to pass a table to a function in lua, but whenever I call lua_newtable, it seems to corrupt the heap. Removing the call to lua_newtable (and changing the number of arguments passed to lua_pcall) removes the heap corruption. I'm not even putting anything in the table at this point. Here is my code, I'm praying someone can tell me something I'm obviously doing wrong:
// ... function is pushed
// ... userdata is pushed as 1st argument

lua_pushstring(L, "some string");

cout << "After pushing table - ";
cout << endl;

if(lua_pcall(L, 3, 0, 0) != 0)
  // handle the error

cout << "After calling handler - ";
cout << endl;

After pushing table - Stack dump:
1.      userdata
2.      table
3.      function
4.      userdata
5.      string [some string]
6.      table

After calling handler - Stack dump:
1.      userdata
2.      table
Note I _am_ properly handling pcall errors where I put "// handle the error", I just omitted it for clarity because that code wasn't getting hit.

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