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-rw-r--r--lib/irb/input-method.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index dbed7da14b..bde6ccdc69 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -255,7 +255,7 @@ module IRB
Reline.input = @stdin
Reline.output = @stdout
Reline.prompt_proc = @prompt_proc
- Reline.auto_indent_proc = @auto_indent_proc
+ Reline.auto_indent_proc = @auto_indent_proc if @auto_indent_proc
if l = readmultiline(@prompt, false, &@check_termination_proc)
HISTORY.push(l) if !l.empty?
@line[@line_no += 1] = l + "\n"