Fix #4575: Check for the previous token’s existence before comparing …

…against it (#4663)
jashkenas · Aug 24, 2017 · c81e2d4 · c81e2d4
1 parent 3dd4582
commit c81e2d4
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diff --git a/lib/coffeescript/lexer.js b/lib/coffeescript/lexer.js
diff --git a/src/lexer.coffee b/src/lexer.coffee
@@ -664,7 +664,7 @@ exports.Lexer = class Lexer
  if value is ';'
  @seenFor = @seenImport = @seenExport = no
  tag = 'TERMINATOR'
- else if value is '*' and prev[0] is 'EXPORT'
+ else if value is '*' and prev?[0] is 'EXPORT'
  tag = 'EXPORT_ALL'
  else if value in MATH then tag = 'MATH'
  else if value in COMPARE then tag = 'COMPARE'