1 files changed, 1 insertions, 1 deletions
diff --git a/src/library.js b/src/library.js
index f4829344..683a2288 100644
--- a/src/library.js
+++ b/src/library.js
@@ -316,7 +316,7 @@ LibraryManager.library = {
             // Command line.
             result = readline();
           }
-          if (!result) return null;
+          if (!result) result = '';
           input.cache = intArrayFromString(result + '\n', true);
         }
         return input.cache.shift();