1 files changed, 1 insertions, 0 deletions
diff --git a/src/library.js b/src/library.js
index 30453137..632df975 100644
--- a/src/library.js
+++ b/src/library.js
@@ -1642,6 +1642,7 @@ LibraryManager.library = {
               next = get();
               {{{ makeSetValue('argPtr++', 0, 'next', 'i8') }}};
             }
+            if (next === 0) return fields-1; // we failed to read this field
             formatIndex += nextC - formatIndex + 1;
             continue;
           }