diff --git a/ppocr/modeling/heads/rec_sar_head.py b/ppocr/modeling/heads/rec_sar_head.py
index 647f58200f83e3f2c23030872c606f299c58f7b7..7107788d9ef3b49ac6d4dcd4a8133a9603ada19b 100644
--- a/ppocr/modeling/heads/rec_sar_head.py
+++ b/ppocr/modeling/heads/rec_sar_head.py
@@ -235,7 +235,8 @@ class ParallelSARDecoder(BaseDecoder):
             # cal mask of attention weight
             for i, valid_ratio in enumerate(valid_ratios):
                 valid_width = min(w, math.ceil(w * valid_ratio))
-                attn_weight[i, :, :, valid_width:, :] = float('-inf')
+                if valid_width < w:
+                    attn_weight[i, :, :, valid_width:, :] = float('-inf')
 
         attn_weight = paddle.reshape(attn_weight, [bsz, T, -1])
         attn_weight = F.softmax(attn_weight, axis=-1)