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-rw-r--r--sqlparse/engine/grouping.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/sqlparse/engine/grouping.py b/sqlparse/engine/grouping.py
index e895ce0..fd1b18d 100644
--- a/sqlparse/engine/grouping.py
+++ b/sqlparse/engine/grouping.py
@@ -432,6 +432,8 @@ def _group(tlist, cls, match,
pidx, prev_ = None, None
for idx, token in enumerate(list(tlist)):
tidx = idx - tidx_offset
+ if tidx < 0: # tidx shouldn't get negative
+ continue
if token.is_whitespace:
continue