diff --git a/deepdoc/parser/pdf_parser.py b/deepdoc/parser/pdf_parser.py
index 6c3324544d..c9a200374d 100644
--- a/deepdoc/parser/pdf_parser.py
+++ b/deepdoc/parser/pdf_parser.py
@@ -830,6 +830,7 @@ def _line_tag(self, bx, ZM):
         pn = [bx["page_number"]]
         top = bx["top"] - self.page_cum_height[pn[0] - 1]
         bott = bx["bottom"] - self.page_cum_height[pn[0] - 1]
+        if pn[-1] - 1 >= len(self.page_images): return ""
         while bott * ZM > self.page_images[pn[-1] - 1].size[1]:
             bott -= self.page_images[pn[-1] - 1].size[1] / ZM
             pn.append(pn[-1] + 1)