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-rw-r--r--mrbgems/mruby-string-ext/mrblib/string.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-string-ext/mrblib/string.rb b/mrbgems/mruby-string-ext/mrblib/string.rb
index 1acdf150f..b8cb93199 100644
--- a/mrbgems/mruby-string-ext/mrblib/string.rb
+++ b/mrbgems/mruby-string-ext/mrblib/string.rb
@@ -169,7 +169,7 @@ class String
if arg1 != nil && arg2 != nil
idx = arg1
idx += self.size if arg1 < 0
- if idx >= 0 && idx < self.size && arg2 > 0
+ if idx >= 0 && idx <= self.size && arg2 > 0
str = self[idx, arg2]
else
return nil