diff --git a/src/if_lua.c b/src/if_lua.c
index bcd0b02..144fcbe 100644
--- a/src/if_lua.c
+++ b/src/if_lua.c
@@ -1862,7 +1862,8 @@
 		return 0;
 	    // Update the value
 	    copy_tv(&tv, &di->di_tv);
-	    dict_add(dict, di);
+	    if (dict_add(dict, di) == FAIL)
+		return luaL_error(L, "Couldn't add to dictionary");
 	} else
 	{
 	    // Clear the old value