Index: lib/runtime/dart/convert.js |
diff --git a/lib/runtime/dart/convert.js b/lib/runtime/dart/convert.js |
index 171551aaeb07340cca0bb781aba7aeed2036180c..2cc625c97e8d6b14bfbcd0ebbd02980f517a2840 100644 |
--- a/lib/runtime/dart/convert.js |
+++ b/lib/runtime/dart/convert.js |
@@ -1400,7 +1400,7 @@ var convert; |
} |
addSlice(chunk, start, end, isLast) { |
if (this[_carry] != null) { |
- chunk = core.String['+'](this[_carry], chunk.substring(start, end)); |
+ chunk = dart.notNull(this[_carry]) + dart.notNull(chunk.substring(start, end)); |
start = 0; |
end = chunk.length; |
this[_carry] = null; |